thyroxin vs thyroxine

thyroxin and thyroxine both are nouns.

Word	Noun	Adjective	Verb	Adverb
thyroxin	Yes	No	No	No
thyroxine	Yes	No	No	No

As nouns, thyroxin and thyroxine are synonyms defined as:

thyroxin and thyroxine: hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells

Other synonyms of thyroxin include T, tetraiodothyronine.

thyroxin (noun)	thyroxine (noun)
hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells	hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells