beta-carotene vs carotene

beta-carotene and carotene both are nouns.

Word	Noun	Adjective	Verb	Adverb
beta-carotene	Yes	No	No	No
carotene	Yes	No	No	No

As nouns, carotene is a hypernym of beta-carotene; that is, carotene is a word with a broader meaning than beta-carotene:

beta-carotene: an isomer of carotene that is found in dark green and dark yellow fruits and vegetables
carotene: an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver

Other hypernyms of beta-carotene include carotenoid, carotin, provitamin A.

beta-carotene (noun)	carotene (noun)
an isomer of carotene that is found in dark green and dark yellow fruits and vegetables	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