mestranol vs estrogen

mestranol and estrogen both are nouns.

Word	Noun	Adjective	Verb	Adverb
mestranol	Yes	No	No	No
estrogen	Yes	No	No	No

As nouns, estrogen is a hypernym of mestranol; that is, estrogen is a word with a broader meaning than mestranol:

mestranol: a synthetic form of estrogen used in combination with a progestin in oral contraceptives
estrogen: a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics

Other hypernyms of mestranol include oestrogen.

mestranol (noun)	estrogen (noun)
a synthetic form of estrogen used in combination with a progestin in oral contraceptives	a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics