stilboestrol vs estrogen

stilboestrol and estrogen both are nouns.

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

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

stilboestrol: a potent estrogen used in medicine and in feed for livestock and poultry
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 stilboestrol include oestrogen.

stilboestrol (noun)	estrogen (noun)
a potent estrogen used in medicine and in feed for livestock and poultry	a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics