Is at least 1 or 2 words?

Is at least 1 or 2 words?

"At least" is always expressed as two words. A more formal version that is somewhat obsolete is "at the very least." "Least" is an adjective.

What’s the word for two things that don’t go together?

dissonantIf things don't go together well, you can call them dissonant.

What 2 things make a sentence?

A complete sentence must have, at minimum, three things: a subject, verb, and an object. The subject is typically a noun or a pronoun. And, if there's a subject, there's bound to be a verb because all verbs need a subject. Finally, the object of a sentence is the thing that's being acted upon by the subject.