ravenala vs ligneous plant

ravenala and ligneous plant both are nouns.

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

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

ravenala: giant treelike plant having edible nuts and leafstalks that yield a refreshing drink of clear watery sap; reputedly an emergency source of water for travelers
ligneous plant: a plant having hard lignified tissues or woody parts especially stems

Other hypernyms of ravenala include woody plant.

ravenala (noun)	ligneous plant (noun)
giant treelike plant having edible nuts and leafstalks that yield a refreshing drink of clear watery sap; reputedly an emergency source of water for travelers	a plant having hard lignified tissues or woody parts especially stems