thiamin vs thiamine

thiamin and thiamine both are nouns.

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

As nouns, thiamin and thiamine are synonyms defined as:

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

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

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