lespedeza vs ligneous plant

lespedeza and ligneous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
lespedeza	Yes	No	No	No
ligneous plant	Yes	No	No	No

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

lespedeza: shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States
ligneous plant: a plant having hard lignified tissues or woody parts especially stems

Other hypernyms of lespedeza include woody plant.

lespedeza (noun)	ligneous plant (noun)
shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States	a plant having hard lignified tissues or woody parts especially stems