knoll vs hammock

knoll and hammock both are nouns.

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

As nouns, knoll and hammock are synonyms defined as:

Other synonyms of knoll include hillock, hummock, mound.

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