Adjective, adverb, or other parts of sentences depending on the particular sentence..
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
'would' is a verb and 'all' is an adjective.
All subjects are part of speech for they are all nouns.
"That'll" is not a part of speech at all; it is a contraction for "that will", in which "that" is a pronoun and "will" an auxiliary verb.
NOUN
Adjective.
adverb
It's a determiner.
All word in the English language have at least one part of speech. Contraptions is a noun, the plural form of contraption.
In this sentence all is a determiner.
Adjective
subject
adjective