fill vs fill out

fill is a noun but fill out is not a noun.

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

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

fill (verb)	fill out (verb)
become full	become round, plump, or shapely
make full, also in a metaphorical sense	make bigger or better or more complete
plug with a substance	write all the required information onto a form
fill to satisfaction	make fat or plump
eat until one is sated	line or stuff with soft material
fill, satisfy or meet a want or need or condition or restriction	supplement what is thought to be deficient
assume, as of positions or roles
appoint someone to (a position or a job)
occupy the whole of