estradiol vs oestradiol

estradiol and oestradiol both are nouns.

Word	Noun	Adjective	Verb	Adverb
estradiol	Yes	No	No	No
oestradiol	Yes	No	No	No

As nouns, estradiol and oestradiol are synonyms defined as:

estradiol and oestradiol: the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer

estradiol (noun)	oestradiol (noun)
the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer	the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer