"At all" is an adverbial phrase commonly used in questions and negatives to emphasize the lack of limitation or extent.
The part of speech for "answer" is a noun.
The part of speech for this particular word is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "buried" is a verb.
'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.
Yes, "casualties" is a noun. It refers to people who are killed or injured in a disaster, accident, battle, or war.
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
subject