madderwort vs flowering plant

madderwort and flowering plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
madderwort	Yes	No	No	No
flowering plant	Yes	No	No	No

As nouns, flowering plant is a hypernym of madderwort; that is, flowering plant is a word with a broader meaning than madderwort:

madderwort: any of numerous trees or shrubs or vines of the family Rubiaceae
flowering plant: plants having seeds in a closed ovary

Other hypernyms of madderwort include angiosperm.

madderwort (noun)	flowering plant (noun)
any of numerous trees or shrubs or vines of the family Rubiaceae	plants having seeds in a closed ovary