oestrone vs estrone

oestrone and estrone both are nouns.

Word	Noun	Adjective	Verb	Adverb
oestrone	Yes	No	No	No
estrone	Yes	No	No	No

As nouns, oestrone and estrone are synonyms defined as:

oestrone and estrone: a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency

Other synonyms of oestrone include Estronol, theelin.

oestrone (noun)	estrone (noun)
a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency	a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency