bandanna vs bandana

bandanna and bandana both are nouns.

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

As nouns, bandanna and bandana are synonyms defined as:

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

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