Liquid can be a noun and an adjective.
Noun: A flowing substance.
Adjective: Flowing freely like water.
It is a plural noun.
Liquid is an adjective. Adjectives describe nouns.
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.