hammock vs hillock

hammock and hillock both are nouns.

Word	Noun	Adjective	Verb	Adverb
hammock	Yes	No	No	No
hillock	Yes	No	No	No

As nouns, hammock and hillock are synonyms defined as:

Other synonyms of hammock include hummock, knoll, mound.

hammock (noun)	hillock (noun)
a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily	a small natural hill
a small natural hill