flowering plant vs angiosperm

flowering plant and angiosperm both are nouns.

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

As nouns, flowering plant and angiosperm are synonyms defined as:

flowering plant (noun)	angiosperm (noun)
plants having seeds in a closed ovary	plants having seeds in a closed ovary