ribbon vs riband

ribbon and riband both are nouns.

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

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

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

Other hyponyms of ribbon include ribband.

ribbon (noun)	riband (noun)
notion consisting of a narrow strip of fine material used for trimming	a ribbon used as a decoration
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