cholecalciferol vs vitamin D

cholecalciferol and vitamin D both are nouns.

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

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

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

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

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