provitamin A vs carotene

provitamin A and carotene both are nouns.

Word	Noun	Adjective	Verb	Adverb
provitamin A	Yes	No	No	No
carotene	Yes	No	No	No

As nouns, provitamin A and carotene are synonyms defined as:

provitamin A and carotene: an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver

Other synonyms of provitamin A include carotin.

provitamin A (noun)	carotene (noun)
an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver	an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver
	yellow or orange-red fat-soluble pigments in plants