roller vs roller skate

roller and roller skate both are nouns.

Word	Noun	Adjective	Verb	Adverb
roller	Yes	No	No	No
roller skate	Yes	No	Yes	No

roller (noun)	roller skate (noun)
a grounder that rolls along the infield	a shoe with pairs of rollers fixed to the sole
Old World bird that tumbles or rolls in flight; related to kingfishers
pigeon that executes backward somersaults in flight or on the ground
a cylinder that revolves
a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it
a small wheel without spokes (as on a roller skate)
a long heavy sea wave as it advances towards the shore

roller (verb)	roller skate (verb)
	travel on shoes with steel or rubber rollers attached to their soles