bandana vs bandanna

bandana and bandanna both are nouns.

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

As nouns, bandana and bandanna are synonyms defined as:

bandana and bandanna: large and brightly colored handkerchief; often used as a neckerchief

bandana (noun)	bandanna (noun)
large and brightly colored handkerchief; often used as a neckerchief	large and brightly colored handkerchief; often used as a neckerchief