ring-binder vs binder

ring-binder and binder both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring-binder	Yes	No	No	No
binder	Yes	No	No	No

As nouns, ring-binder and binder are synonyms defined as:

ring-binder (noun)	binder (noun)
holds loose papers or magazines	something used to tie or bind
	holds loose papers or magazines
	a machine that cuts grain and binds it in sheaves
	something used to bind separate particles together or facilitate adhesion to a surface