monocot vs flowering plant

monocot and flowering plant both are nouns.

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

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

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

Other hypernyms of monocot include angiosperm.

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