gonadotrophin vs gonadotropin

gonadotrophin and gonadotropin both are nouns.

Word	Noun	Adjective	Verb	Adverb
gonadotrophin	Yes	No	No	No
gonadotropin	Yes	No	No	No

As nouns, gonadotrophin and gonadotropin are synonyms defined as:

gonadotrophin and gonadotropin: hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity

Other synonyms of gonadotrophin include gonadotrophic hormone, gonadotropic hormone.

gonadotrophin (noun)	gonadotropin (noun)
hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity	hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity