riband vs ribbon

riband and ribbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
riband	Yes	No	No	No
ribbon	Yes	No	No	No

As nouns, ribbon is a hypernym of riband; that is, ribbon is a word with a broader meaning than riband:

riband: a ribbon used as a decoration
ribbon: notion consisting of a narrow strip of fine material used for trimming

riband (noun)	ribbon (noun)
a ribbon used as a decoration	notion consisting of a narrow strip of fine material used for trimming
	a long strip of inked material for making characters on paper with a typewriter
	an award for winning a championship or commemorating some other event
	any long object resembling a thin line