fool vs eat up

fool is a noun but eat up is not a noun.

Word	Noun	Adjective	Verb	Adverb
fool	Yes	No	Yes	No
eat up	No	No	Yes	No

fool (noun)	eat up (noun)
a person who lacks good judgment
a person who is gullible and easy to take advantage of
a professional clown employed to entertain a king or nobleman in the Middle Ages

fool (verb)	eat up (verb)
indulge in horseplay	finish eating all the food on one's plate or on the table
fool or hoax	use up (resources or materials)
spend frivolously and unwisely	enclose or envelop completely, as if by swallowing
make a fool or dupe of