mestranol vs oestrogen

mestranol and oestrogen both are nouns.

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

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

mestranol: a synthetic form of estrogen used in combination with a progestin in oral contraceptives
oestrogen: 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 estrogen.

mestranol (noun)	oestrogen (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