hill vs knoll

hill and knoll both are nouns.

Word	Noun	Adjective	Verb	Adverb
hill	Yes	No	Yes	No
knoll	Yes	No	No	No

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

Other hyponyms of hill include butte, foothill, hammock, hillock, hummock, mound, tor.

hill (noun)	knoll (noun)
(baseball) the slight elevation on which the pitcher stands	a small natural hill
structure consisting of an artificial heap or bank usually of earth or stones
a local and well-defined elevation of the land

hill (verb)	knoll (verb)
form into a hill