gesneriad vs ligneous plant

gesneriad and ligneous plant both are nouns.

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

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

gesneriad: any of numerous tropical or subtropical small shrubs or treelets or epiphytic vines of the family Gesneriaceae: African violet; Cape primroses; gloxinia
ligneous plant: a plant having hard lignified tissues or woody parts especially stems

Other hypernyms of gesneriad include woody plant.

gesneriad (noun)	ligneous plant (noun)
any of numerous tropical or subtropical small shrubs or treelets or epiphytic vines of the family Gesneriaceae: African violet; Cape primroses; gloxinia	a plant having hard lignified tissues or woody parts especially stems