"Fifteen" is an adjective when used to describe a noun, as in "fifteen people." It can also be a noun when referring to the number itself, as in "I will be there in fifteen."
The part of speech for "answer" is a noun.
The part of speech for this particular word is a noun.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "explicit" is an adjective.
The part of speech for "buried" is a verb.
"Fifteen". like all the cardinal numbers, can be either a noun or an adjective. Example as a noun: Fifteen is the product of five and three. Example as an adjective: Fifteen students will be selected for the trip.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
because he made a speech that changed everyone
Sashay is a verb. It means to walk in an exaggerated, showy manner, often with hip swaying.
"Did not" or "didn't" is a contraction of the auxiliary verb "did" and the adverb "not," forming a negative past tense construction in English.
I assume you are referring to J.S. Bach here; he wrote fifteen two-part inventions, and fifteen three-part inventions
Adjective
The word speech is a noun.