trick or treat vs asking

trick or treat and asking both are nouns.

Word	Noun	Adjective	Verb	Adverb
trick or treat	Yes	No	No	No
asking	Yes	No	No	No

As nouns, asking is a hypernym of trick or treat; that is, asking is a word with a broader meaning than trick or treat:

trick or treat: a request by children on Halloween; they pass from door to door asking for goodies and threatening to play tricks on those who refuse
asking: the verbal act of requesting

Other hypernyms of trick or treat include request.

trick or treat (noun)	asking (noun)
a request by children on Halloween; they pass from door to door asking for goodies and threatening to play tricks on those who refuse	the verbal act of requesting