retinol vs vitamin A

retinol and vitamin A both are nouns.

Word	Noun	Adjective	Verb	Adverb
retinol	Yes	No	No	No
vitamin A	Yes	No	No	No

As nouns, vitamin A is a hypernym of retinol; that is, vitamin A is a word with a broader meaning than retinol:

retinol: an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene
vitamin A: any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

Other hypernyms of retinol include A, antiophthalmic factor, axerophthol.

retinol (noun)	vitamin A (noun)
an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene	any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes