shallow vs shelfy

shallow is a noun but shelfy is not a noun.

Word	Noun	Adjective	Verb	Adverb
shallow	Yes	Yes	Yes	No
shelfy	No	Yes	No	No

shallow (noun)	shelfy (noun)
a stretch of shallow water

shallow (adjective)	shelfy (adjective)
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center	full of submerged reefs or sandbanks or shoals
not deep or strong; not affecting one deeply
lacking depth of intellect or knowledge; concerned only with what is obvious

shallow (verb)	shelfy (verb)
become shallow
make shallow