oestradiol vs estradiol

oestradiol and estradiol both are nouns.

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

As nouns, oestradiol and estradiol are synonyms defined as:

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

oestradiol (noun)	estradiol (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