tetraiodothyronine vs thyroxin

tetraiodothyronine and thyroxin both are nouns.

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

As nouns, tetraiodothyronine and thyroxin are synonyms defined as:

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

Other synonyms of tetraiodothyronine include T, thyroxine.

tetraiodothyronine (noun)	thyroxin (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