hill vs foothill

hill and foothill both are nouns.

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

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

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

hill (noun)	foothill (noun)
(baseball) the slight elevation on which the pitcher stands	a relatively low hill on the lower slope of a mountain
structure consisting of an artificial heap or bank usually of earth or stones
a local and well-defined elevation of the land

hill (verb)	foothill (verb)
form into a hill