parsley vs herbaceous plant

parsley and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
parsley	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

parsley: annual or perennial herb with aromatic leaves
herbaceous plant: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of parsley include herb.

parsley (noun)	herbaceous plant (noun)
aromatic herb with flat or crinkly leaves that are cut finely and used to garnish food	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
annual or perennial herb with aromatic leaves