Noun.
It is a noun.
ad
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
what part of speech is work
adverb
And is a conjunction.
the part of speech sashay is a averb
Did is a verb, and not is an adverb. Didn't is not any part of speech. It's a contraction of did and not.
The word speech is a noun.
Adjective