thyroxin vs tetraiodothyronine

thyroxin and tetraiodothyronine both are nouns.

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

As nouns, thyroxin and tetraiodothyronine are synonyms defined as:

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

Other synonyms of thyroxin include T, thyroxine.

thyroxin (noun)	tetraiodothyronine (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