roller vs trundle

roller and trundle both are nouns.

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

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

Other hyponyms of roller include garden roller, paint roller, platen, sprocket.

roller (noun)	trundle (noun)
a grounder that rolls along the infield	small wheel or roller
Old World bird that tumbles or rolls in flight; related to kingfishers	a low bed to be slid under a higher bed
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)	trundle (verb)
	move heavily