monocotyledon vs angiosperm

monocotyledon and angiosperm both are nouns.

Word	Noun	Adjective	Verb	Adverb
monocotyledon	Yes	No	No	No
angiosperm	Yes	No	No	No

As nouns, angiosperm is a hypernym of monocotyledon; that is, angiosperm is a word with a broader meaning than monocotyledon:

monocotyledon: a monocotyledonous flowering plant; the stem grows by deposits on its inside
angiosperm: plants having seeds in a closed ovary

Other hypernyms of monocotyledon include flowering plant.

monocotyledon (noun)	angiosperm (noun)
a monocotyledonous flowering plant; the stem grows by deposits on its inside	plants having seeds in a closed ovary