thru vs Thu, What's the Difference?

Which to use

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

#9,266
“thru” frequency rank: #24,339
“Thu” frequency rank: 33605
confusion score

Side-by-Side Comparison

Feature	thru	Thu
Definition	Nonstandard spelling of through.	A surname.

Letter map: thru vs Thu

Shared letters muted; letters that set thru and Thu apart highlighted. Shared run: 3.

4 ch

thru

3 ch

Thu

Role in the sentence - thru and Thu

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: thru is apreposition and Thuaname. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 33605, 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/. Thu is at rank #24,339, tagged as aname.

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 33605, this pair ranks #327,986 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of thru vs Thu

Shared letters: htu. Private to "thru": r. Private to "Thu": -.

"thru" · 4 letters · shape CCCV · "Thu" · 3 letters · shape CCV

Known mistypes of this pair

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

Frequently Asked Questions

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

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

In ordinary English text, does "thru" or "Thu" show up more?

"thru" is the more common of the two: it sits at frequency rank #9,266 in our English list, against #24,339 for "Thu". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Pair "thru" vs "Thu" is on the table, pick a follow-up below.

Full dictionary entry for "thru" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "Thu" - compare definitions side by side with the headword page. Word entry
This pair ranks #327,986 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"thru" and "Thu" also get mixed up with nearby pairs, the highest-scored neighbour is "Taf vs Thu". 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 #327,986 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.