mouthful vs sup

mouthful and sup both are nouns.

Word	Noun	Adjective	Verb	Adverb
mouthful	Yes	No	No	No
sup	Yes	No	Yes	No

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

Other hyponyms of mouthful include bit, bite, morsel, swallow.

mouthful (noun)	sup (noun)
a small amount eaten or drunk	a small amount of liquid food
the quantity that can be held in the mouth

mouthful (verb)	sup (verb)
	take solid or liquid food into the mouth a little at a time either by drinking or by eating with a spoon