vitamin D vs ergocalciferol

vitamin D and ergocalciferol both are nouns.

Word	Noun	Adjective	Verb	Adverb
vitamin D	Yes	No	No	No
ergocalciferol	Yes	No	No	No

As nouns, vitamin D and ergocalciferol are synonyms defined as:

vitamin D and ergocalciferol: a fat-soluble vitamin that prevents rickets

Other synonyms of vitamin D include calciferol, cholecalciferol, D, viosterol.

vitamin D (noun)	ergocalciferol (noun)
a fat-soluble vitamin that prevents rickets	a fat-soluble vitamin that prevents rickets