dinner vs banquet

dinner and banquet both are nouns.

Word	Noun	Adjective	Verb	Adverb
dinner	Yes	No	No	No
banquet	Yes	No	Yes	No

As nouns, banquet is a hyponym of dinner; that is, banquet is a word with a more specific, narrower meaning than dinner:

Other hyponyms of dinner include feast, beanfeast.

dinner (noun)	banquet (noun)
the main meal of the day served in the evening or at midday	a meal that is well prepared and greatly enjoyed
a party of people assembled to have dinner together	a ceremonial dinner party for many people

dinner (verb)	banquet (verb)
	partake in a feast or banquet
	provide a feast or banquet for