beta-carotene vs carotenoid

beta-carotene and carotenoid both are nouns.

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

As nouns, carotenoid is a hypernym of beta-carotene; that is, carotenoid 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
carotenoid: any of a class of highly unsaturated yellow to red pigments occurring in plants and animals

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

beta-carotene (noun)	carotenoid (noun)
an isomer of carotene that is found in dark green and dark yellow fruits and vegetables	any of a class of highly unsaturated yellow to red pigments occurring in plants and animals