reaper vs binder

reaper and binder both are nouns.

Word	Noun	Adjective	Verb	Adverb
reaper	Yes	No	No	No
binder	Yes	No	No	No

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

Other hyponyms of reaper include reaper binder, combine, header.

reaper (noun)	binder (noun)
farm machine that gathers a food crop from the fields	something used to tie or bind
someone who helps to gather the harvest	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