kopje vs hammock

kopje and hammock both are nouns.

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

As nouns, hammock is a hypernym of kopje; that is, hammock is a word with a broader meaning than kopje:

Other hypernyms of kopje include hillock, hummock, knoll, mound.

kopje (noun)	hammock (noun)
a small hill rising up from the African veld	a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily
	a small natural hill