foo vs form, What's the Difference?

Which to use

“foo” is a noun and “form” is a verb - they look or sound alike but fill different roles in a sentence.

#43,447
“foo” frequency rank: #26,370
“form” frequency rank: 69817
confusion score

Side-by-Side Comparison

Feature	foo	form
Definition	Variable métasyntaxique en programmation informatique.	Deuxième personne du singulier de l’impératif présent de formen.

Where the spellings diverge

Shared letters are muted; the letters that actually set foo and form apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

3 ch

foo

4 ch

form

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: foo is \fu\ while form is \fɔʁm\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs verb), which is usually the fastest check. Our composite confusion score for this pair is 69817, derived from the frequency rank of both members and their visual similarity.

foo is recorded at frequency rank #43,447, classified as anoun, pronounced \fu\. form is at rank #26,370, tagged as averb, pronounced \fɔʁm\.

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 69817, this pair ranks #53,706 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of foo vs form

Shared letters: fo. Private to "foo": -. Private to "form": mr.

"foo" · 3 letters · shape CVV · "form" · 4 letters · shape CVCC

Known mistypes of this pair

form ← fform · fomr · formm · forrm · ofrm

Frequency comparison

foo#43,447

form#26,370

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "foo" and "form" be used interchangeably?

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

Which is more common, "foo" or "form"?

"form" is the more common of the two: it sits at frequency rank #26,370 in our French list, against #43,447 for "foo". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering foo vs form

The fastest way to pick the right one every time.

Check the role first: if you need a noun, it's “foo”; for a verb, it's “form”.
See each word in full, definition, IPA, etymology and its other confusables. Full “foo” entry
Browse more pairs most likely to be confused. Most confusable