formula vs open, What's the Difference?

Which to use

“formula” is a noun and “open” is an adjective - they look or sound alike but fill different roles in a sentence.

#38,745
“formula” frequency rank: #2,607
“open” frequency rank: 41352
confusion score

Side-by-Side Comparison

Feature	formula	open
Definition	die Formel	etwas ist nicht geschlossen

Letter map: formula vs open

Shared letters muted; letters that set formula and open apart highlighted. Shared run: 1.

7 ch

formula

4 ch

open

Part-of-speech tell for formula / open

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: formula is anoun and openanadjective. On the page they differ by 3 letter(s) in length. Our composite confusion score for this pair is 41352, derived from the frequency rank of both members and their visual similarity.

formula is recorded at frequency rank #38,745, classified as anoun, pronounced […]. open is at rank #2,607, tagged as anadj, pronounced […].

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 41352, this pair ranks #1,482,018 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of formula vs open

Shared letters: o. Private to "formula": aflmru. Private to "open": enp.

"formula" · 7 letters · shape CVCCVCV · "open" · 4 letters · shape VCVC

Known mistypes of this pair

formula ← fformula · fomrula · formlua · formmula · formual · formulla · forrmula · forumla
open ← oepn · openn · opne · oppen · poen

Frequently Asked Questions

Is swapping "formula" for "open" ever safe?

No - they are not even the same part of speech. "formula" is a noun and "open" an adjective, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "formula" or "open"?

"open" is the more common of the two: it sits at frequency rank #2,607 in our German list, against #38,745 for "formula". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

You've compared "formula" and "open". Here's where to go from here.

Full dictionary entry for "formula" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "open" - compare definitions side by side with the headword page. Word entry
This pair ranks #1,482,018 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
"formula" and "open" also get mixed up with nearby pairs, the highest-scored neighbour is "formula vs puzzles". 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 #1,482,018 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.