wide-body aircraft vs airliner

wide-body aircraft and airliner both are nouns.

Word	Noun	Adjective	Verb	Adverb
wide-body aircraft	Yes	No	No	No
airliner	Yes	No	No	No

As nouns, airliner is a hypernym of wide-body aircraft; that is, airliner is a word with a broader meaning than wide-body aircraft:

wide-body aircraft (noun)	airliner (noun)
a commercial airliner with two aisles	a commercial airplane that carries passengers