carotene vs carotenoid

carotene and carotenoid both are nouns.

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

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

carotene: yellow or orange-red fat-soluble pigments in plants
carotenoid: any of a class of highly unsaturated yellow to red pigments occurring in plants and animals

carotene (noun)	carotenoid (noun)
an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver	any of a class of highly unsaturated yellow to red pigments occurring in plants and animals
yellow or orange-red fat-soluble pigments in plants