thatvsTHCTell them apart

Quick tell: that is a conjunction, THC is a noun, so they fill different roles in a sentence.

Which to use

“that” is a conjunction and “THC” is a noun - they look or sound alike but fill different roles in a sentence.

#10
“that” frequency rank
#19,484
“THC” frequency rank
19494
confusion score

Side-by-Side Comparison

Feature that THC
Definition Introducing a clause that is the object of a verb, especially a reporting verb or verb expressing belief, knowledge, perception, etc. Initialism of tetrahydrocannabinol.

Letter map: that vs THC

Shared letters muted; letters that set that and THC apart highlighted. Shared run: 2.

4 ch
that
3 ch
THC

Role in the sentence - that and THC

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: that is aconjunction and THCanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 19494, derived from the frequency rank of both members and their visual similarity.

that is recorded at frequency rank #10, classified as aconj, pronounced /ðət/. THC is at rank #19,484, tagged as anoun.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 19494, this pair ranks #437,767 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of that vs THC

Shared letters: ht. Private to "that": a. Private to "THC": c.

"that" · 4 letters · shape CCVC  ·  "THC" · 3 letters · shape CCC

Known mistypes of this pair

  • thathtat · taht · thatt · thhat · thta · tthat

Frequently Asked Questions

Do "that" and "THC" mean the same thing in a sentence?
No - they are not even the same part of speech. "that" is a conjunction and "THC" a noun, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "that" or "THC"?
"that" is the more common of the two: it sits at frequency rank #10 in our English list, against #19,484 for "THC". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Pair "that" vs "THC" is on the table, pick a follow-up below.

  • Full dictionary entry for "that" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "THC" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #437,767 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "that" and "THC" also get mixed up with nearby pairs, the highest-scored neighbour is "Taf vs THC". Nearby pair
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #437,767 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list