thiamine vs thiamin

thiamine and thiamin both are nouns.

Word	Noun	Adjective	Verb	Adverb
thiamine	Yes	No	No	No
thiamin	Yes	No	No	No

As nouns, thiamine and thiamin are synonyms defined as:

thiamine and thiamin: a B vitamin that prevents beriberi; maintains appetite and growth

Other synonyms of thiamine include aneurin, antiberiberi factor, vitamin B1.

thiamine (noun)	thiamin (noun)
a B vitamin that prevents beriberi; maintains appetite and growth	a B vitamin that prevents beriberi; maintains appetite and growth