hosiery vs tights

hosiery and tights both are nouns.

Word	Noun	Adjective	Verb	Adverb
hosiery	Yes	No	No	No
tights	Yes	No	No	No

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

hosiery: socks and stockings and tights collectively (the British include underwear)
tights: skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls

Other hyponyms of hosiery include sock, stocking, leotards.

hosiery (noun)	tights (noun)
socks and stockings and tights collectively (the British include underwear)	skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls