hanky vs bandanna

hanky and bandanna both are nouns.

Word	Noun	Adjective	Verb	Adverb
hanky	Yes	No	No	No
bandanna	Yes	No	No	No

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

hanky: a square piece of cloth used for wiping the eyes or nose or as a costume accessory
bandanna: large and brightly colored handkerchief; often used as a neckerchief

Other hyponyms of hanky include bandana, pocket-handkerchief.

hanky (noun)	bandanna (noun)
a square piece of cloth used for wiping the eyes or nose or as a costume accessory	large and brightly colored handkerchief; often used as a neckerchief