figwort vs ligneous plant

figwort and ligneous plant both are nouns.

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

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

figwort: any of numerous tall coarse woodland plants of the genus Scrophularia
ligneous plant: a plant having hard lignified tissues or woody parts especially stems

Other hypernyms of figwort include woody plant.

figwort (noun)	ligneous plant (noun)
any of numerous tall coarse woodland plants of the genus Scrophularia	a plant having hard lignified tissues or woody parts especially stems