"All" can be an adjective, adverb, pronoun or noun depending on the usage.
'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.
It's a determiner.
adverb
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
All and all is a phrase it is not a part of speech. Words are parts of speech.I think the phrase should be all in all not all and all.All in all is used to introduce a summary or a general statement - All in all it was a good day.
subject