flavonoid vs phytochemical

flavonoid and phytochemical both are nouns.

Word	Noun	Adjective	Verb	Adverb
flavonoid	Yes	No	No	No
phytochemical	Yes	No	No	No

As nouns, phytochemical is a hypernym of flavonoid; that is, phytochemical is a word with a broader meaning than flavonoid:

flavonoid: any of a large class of plant pigments having a chemical structure based on or similar to flavone
phytochemical: a chemical substance obtained from plants that is biologically active but not nutritive

Other hypernyms of flavonoid include pigment.

flavonoid (noun)	phytochemical (noun)
any of a large class of plant pigments having a chemical structure based on or similar to flavone	a chemical substance obtained from plants that is biologically active but not nutritive