'would' is a verb and 'all' is an adjective.
All subjects are part of speech for they are all nouns.
it depends what word it is it could be any part of speech depending on the sentence
"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.
My Mommy could tell you the answer
Venom could be a noun.
NOUN
Adjective.
It's a determiner.
adverb
The word binding could belong to more than one part of speech. It could be a participle or a noun.
It could either be an adjective or a pronoun. It depends in which context.
All word in the English language have at least one part of speech. Contraptions is a noun, the plural form of contraption.