tools-only Vocabulary Patterns in AI-Generated Text
Comprehensive reference of words, phrases, and vocabulary patterns that indicate AI authorship.
High-Signal Words
These words appear 50-700x more frequently in AI-generated text than human writing:
Extreme Frequency (100x+ more common in AI)
| Word/Phrase | Frequency vs Human | Notes |
|---|---|---|
| "complex and multifaceted" | 700x | Almost exclusively AI |
| "intricate interplay" | 100x | Strong AI signal |
| "played a crucial role" | 70x | Very common AI phrase |
| "delve" / "delving" | 50x+ | Most discussed AI tell (declined in 2025 ChatGPT) |
| "tapestry" (metaphorical) | 50x+ | "Rich tapestry of..." |
| "stands/serves as" | 50x+ | "Stands as a testament to..." |
| "marking a pivotal moment" | 50x+ | Historical significance puffery |
| "underscores/highlights its importance" | 50x+ | Importance attribution |
Strong Signal Words (10-50x more common)
Verbs:
- delve, delved, delving
- embark, embarking
- foster, fostering
- underscore, underscoring
- leverage, leveraging
- navigate, navigating
- unravel, unraveling
- unlock, unlocking
- unveil, unveiling
- illuminate, illuminating
- elucidate, elucidating
- resonate, resonating
- transcend, transcending
- spearhead, spearheading
- hone, honing
- harness, harnessing
- captivate, captivating
- enrich, enriching
- revolutionize, revolutionizing
- garner, garnering
- showcase, showcasing
- highlight (as verb)
- boast, boasting (promotional)
- align with
Adjectives:
- multifaceted
- nuanced
- pivotal
- paramount
- profound
- meticulous
- intricate
- holistic
- robust
- groundbreaking
- cutting-edge
- revolutionary
- game-changing
- invaluable
- unwavering
- commendable
- enduring
- lasting
- vibrant
- impactful
- crucial
- vital
- key (as adjective)
Promotional/Puffery Adjectives:
- stunning (natural beauty)
- breathtaking
- nestled (in/within)
- rich (cultural heritage)
- diverse (tapestry)
- fascinating
- remarkable
- exceptional
Nouns:
- tapestry
- realm
- landscape (metaphorical)
- journey (metaphorical)
- quest
- labyrinth
- symphony
- treasure trove
- beacon
- crucible
- enigma
- paradigm
- synergy
- cornerstone
- testament
- interplay
- legacy
- heritage
- hub (regional hub, dynamic hub)
- turning point
- milestone
Adverbs:
- furthermore
- moreover
- notably
- importantly
- ultimately
- subsequently
- nonetheless
- arguably
Moderate Signal Words (5-10x more common)
These are flagged but require corroborating evidence:
- comprehensive
- crucial
- vital
- essential
- significant
- remarkable
- exceptional
- innovative
- transformative
- dynamic
- seamless
- streamlined
Overused Phrases
Highest Confidence Phrases
These phrases almost always indicate AI authorship:
"It's important to note that..."
"It's worth noting that..."
"It should be noted that..."
"In today's fast-paced world..."
"In the ever-evolving landscape of..."
"A deeper understanding of..."
"Unlock the power of..."
"At its core..."
"That being said..."
"To put it simply..."
"In light of this..."
"Without further ado..."
"Let me explain..."
"Certainly, [here is/here are]..."
"As of my last..."
"I hope this helps!"
Strong Signal Phrases
Opening phrases:
- "Have you ever wondered..."
- "In the realm of..."
- "When it comes to..."
- "In the world of..."
- "Let's dive into..."
- "Welcome to..."
Transition phrases:
- "With that in mind..."
- "Building on this..."
- "Taking it a step further..."
- "On another note..."
- "Moving forward..."
Conclusion phrases:
- "In summary..."
- "In conclusion..."
- "To summarize..."
- "All in all..."
- "At the end of the day..."
- "The bottom line is..."
Correlative constructions:
- "Not only...but also..."
- "Whether...or..."
- "On the one hand...on the other hand..."
- "Both...and..."
Importance/Symbolism Phrases
These phrases attribute significance to mundane facts:
marking a pivotal moment in
a significant shift toward
reflects broader [trends/movements]
symbolizing its ongoing/enduring impact
key turning point in
plays a vital/crucial/pivotal role in
deeply rooted in
profound heritage
indelible mark on
steadfast dedication to
is a testament to
serves as a reminder of
important to social cohesion
promotes collaboration
reinforces [positive outcome]
Vague Attribution Phrases (Weasel Words)
AI attributes claims to unnamed authorities:
Industry reports [suggest/indicate]
Observers have cited
Experts argue
Some critics argue
Scholars suggest
Research indicates
Many believe
It is widely recognized
According to [vague source]
Promotional/Location Phrases
Particularly common in geographic or cultural content:
nestled within
in the heart of
boasts a [feature]
continues to captivate
stunning natural beauty
breathtaking [scenery/views]
rich cultural heritage
vibrant [community/town]
fascinating glimpse into
diverse tapestry of
dynamic hub of
Hedging Language Clusters
AI overuses qualifiers. Watch for clusters of:
arguably
somewhat
generally
might
could
perhaps
potentially
in many cases
often
typically
tends to
may be
it seems
appears to
likely
possibly
When 3+ hedging terms appear in close proximity, it's a moderate AI signal.
Vocabulary Frequency Analysis
Type-Token Ratio (TTR)
What it measures: Unique words / total words
Counterintuitive finding:
- ChatGPT: 0.69 TTR (higher diversity)
- Human students: 0.61 TTR (lower diversity)
This means AI sometimes has MORE vocabulary diversity, but lower "meaningful" diversity. AI uses varied words but says similar things.
Hapax Legomenon Rate
What it measures: Words appearing only once in the text
Key finding: Human text has higher hapax rates - humans use more truly unique word choices that they don't repeat.
Stop Word Patterns
What they are: Function words (the, is, at, which, on)
AI pattern: More uniform stop word distribution Human pattern: More varied, context-dependent usage
Latinate vs Germanic Vocabulary
AI tends toward formal Latinate vocabulary:
| AI Prefers | Human Often Uses |
|---|---|
| utilize | use |
| commence | start/begin |
| terminate | end |
| facilitate | help |
| implement | do/make |
| demonstrate | show |
| possess | have |
| obtain | get |
| require | need |
| assist | help |
This pattern alone is weak but combines with other signals.
Model-Specific Vocabulary
ChatGPT/GPT-4 Favorites
- "delve" (usage dropped sharply in 2025)
- "tapestry"
- "nuanced"
- "multifaceted"
- "It's not about X; it's about Y"
- Curly quotation marks ("..." instead of "...")
Note on "delve": This word was famously overused by ChatGPT until 2025, when its incidence dropped off sharply. It remains a strong signal for pre-2025 ChatGPT content.
Claude Favorites
- Extended analogies
- "That said..."
- Methodical numbering
- Cautious qualifications
Gemini Favorites
- Current event references
- Practical/applied framing
- Conversational transitions
Detection Implementation
Scoring Approach
For each text:
1. Count occurrences of high-signal words
2. Calculate density (flagged words / total words)
3. Check for phrase patterns
4. Weight by signal strength
Suggested thresholds:
- 0-2 flagged terms: Normal
- 3-5 flagged terms: Worth investigating
- 6+ flagged terms: Strong AI signal
- Any "extreme frequency" phrase: Immediate flag
Caveats
- Single word matches prove nothing
- Academic/formal writing naturally uses some flagged terms
- Non-native speakers may use these patterns innocently
- Always require multiple corroborating signals