arugula vs herbaceous plant

arugula and herbaceous plant both are nouns.

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

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

arugula: erect European annual often grown as a salad crop to be harvested when young and tender
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 arugula include herb.

arugula (noun)	herbaceous plant (noun)
erect European annual often grown as a salad crop to be harvested when young and tender	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests