Prospectors is a plural noun.
A prompt speech is essentially the same as a writing prompt.The prospective speaker will be given a topic on which they are intended to give a speech. This is an exercise in communication skills and improvisation.
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
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.
Adjective
The word speech is a noun.
No, but it's part of a noun which the noun is the part of speech.
Yes, conjunction is a part of speech.