geranium vs herbaceous plant

geranium and herbaceous plant both are nouns.

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

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

geranium: any of numerous plants of the family Geraniaceae
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 geranium include herb.

geranium (noun)	herbaceous plant (noun)
any of numerous plants of the family Geraniaceae	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests