headband vs fillet

headband and fillet both are nouns.

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

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

Other hyponyms of headband include taenia, tenia.

headband (noun)	fillet (noun)
a band worn around or over the head	a narrow headband or strip of ribbon worn as a headband
	fastener consisting of a narrow strip of welded metal used to join steel members
	lace having a square mesh
	a bundle of sensory nerve fibers going to the thalamus
	a boneless steak cut from the tenderloin of beef
	a longitudinal slice or boned side of a fish

headband (verb)	fillet (verb)
	cut into filets
	decorate with a lace of geometric designs