fill up vs fill

fill up is not a noun while fill is a noun.

Word	Noun	Adjective	Verb	Adverb
fill up	No	No	Yes	No
fill	Yes	No	Yes	No

As verbs, fill up and fill are synonyms defined as:

Other synonyms of fill up include make full.

As verbs, fill up and fill are synonyms defined as:

As verbs, fill up and fill are synonyms defined as:

As verbs, fill is a hypernym of fill up; that is, fill is a word with a broader meaning than fill up:

fill up (noun)	fill (noun)
	a quantity sufficient to satisfy
	any material that fills a space or container

fill up (verb)	fill (verb)
make full, also in a metaphorical sense	become full
become full	make full, also in a metaphorical sense
eat until one is sated	plug with a substance
fill or stop up	fill to satisfaction
	eat until one is sated
	fill, satisfy or meet a want or need or condition or restriction
	assume, as of positions or roles
	appoint someone to (a position or a job)
	occupy the whole of