Increment can be a noun and a verb.
Noun: the action of increasing.
Verb: to increase by steps.
Yes, you can have multiple expressions in the increment poart of the for loop statement. Just use the comma, and each expression will be evaluated from left to right.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.
The part of speech for "indefinite" is an adjective.