drunken reveller vs drinker

drunken reveller and drinker both are nouns.

Word	Noun	Adjective	Verb	Adverb
drunken reveller	Yes	No	No	No
drinker	Yes	No	No	No

As nouns, drinker is a hypernym of drunken reveller; that is, drinker is a word with a broader meaning than drunken reveller:

Other hypernyms of drunken reveller include imbiber, juicer, toper.

drunken reveller (noun)	drinker (noun)
someone who engages in drinking bouts	a person who drinks alcoholic beverages (especially to excess)
	a person who drinks liquids