D vs cholecalciferol

D and cholecalciferol both are nouns.

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

As nouns, D and cholecalciferol are synonyms defined as:

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

D (noun)	cholecalciferol (noun)
the 4th letter of the Roman alphabet	a fat-soluble vitamin that prevents rickets
the cardinal number that is the product of one hundred and five
a fat-soluble vitamin that prevents rickets