headband vs taenia

headband and taenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
headband	Yes	No	No	No
taenia	Yes	No	No	No

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

Other hyponyms of headband include fillet, tenia.

headband (noun)	taenia (noun)
a band worn around or over the head	tapeworms parasitic in humans which uses the pig as its intermediate host
	a narrow headband or strip of ribbon worn as a headband