thru vs THT, What's the Difference?

Which to use

“thru” is a preposition and “THT” is a noun - they look or sound alike but fill different roles in a sentence.

#9,266
“thru” frequency rank: #42,949
“THT” frequency rank: 52215
confusion score

Side-by-Side Comparison

Feature	thru	THT
Definition	Nonstandard spelling of through.	Initialism of through-hole technology.

Letter map: thru vs THT

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

4 ch

thru

3 ch

THT

Role in the sentence - thru and THT

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: thru is apreposition and THTanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 52215, derived from the frequency rank of both members and their visual similarity.

thru is recorded at frequency rank #9,266, classified as aprep, pronounced /θɹuː/. THT is at rank #42,949, 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 52215, this pair ranks #158,921 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of thru vs THT

Shared letters: ht. Private to "thru": ru. Private to "THT": -.

"thru" · 4 letters · shape CCCV · "THT" · 3 letters · shape CCC

Known mistypes of this pair

thru ← htru · thhru · thrru · thur · trhu · tthru

Frequently Asked Questions

Is swapping "thru" for "THT" ever safe?

No - they are not even the same part of speech. "thru" is a preposition and "THT" a noun, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "thru" vs "THT" - which ranks higher?

"thru" is the more common of the two: it sits at frequency rank #9,266 in our English list, against #42,949 for "THT". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Done with this confusable. These links stay specific to "thru" and "THT".

Full dictionary entry for "thru" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "THT" - compare definitions side by side with the headword page. Word entry
This pair ranks #158,921 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"thru" and "THT" also get mixed up with nearby pairs, the highest-scored neighbour is "THT vs tuft". 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 #158,921 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.