carotene vs provitamin A

carotene and provitamin A both are nouns.

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

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

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

Other synonyms of carotene include carotin.

carotene (noun)	provitamin A (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