Is can’t a word?

Yes, can’t is the contraction of “cannot” (i.e., the negative form of the modal verb “can”).

It’s generally best to use “cannot” instead of “can’t” in formal writing.

Along the same lines, confusion over cannot vs can not sometimes leads to the misspelling of “cannot” as “can not” (two words instead of one).

“Cant” (with no apostrophe) is a noun referring to statements that the speaker doesn’t really believe in, often made because they are considered the usual, accepted thing to say in the given situation (e.g., “It was nothing more than cant; stock phrases and jargon that told us nothing new”).

You can use QuillBot’s free Grammar Checker to help you avoid missing out apostrophes in contractions like “can’t.”