pantyhose vs tights

pantyhose and tights both are nouns.

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

As nouns, tights is a hypernym of pantyhose; that is, tights is a word with a broader meaning than pantyhose:

pantyhose: a woman's tights consisting of underpants and stockings
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 hypernyms of pantyhose include leotards.

pantyhose (noun)	tights (noun)
a woman's tights consisting of underpants and stockings	skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls