chittimwood vs buckthorn

chittimwood and buckthorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
chittimwood	Yes	No	No	No
buckthorn	Yes	No	No	No

As nouns, buckthorn is a hypernym of chittimwood; that is, buckthorn is a word with a broader meaning than chittimwood:

As nouns, buckthorn is a hypernym of chittimwood; that is, buckthorn is a word with a broader meaning than chittimwood:

chittimwood: shrubby tree of the Pacific coast of the United States; yields cascara sagrada
buckthorn: a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments

chittimwood (noun)	buckthorn (noun)
deciduous tree of southeastern United States and Mexico	any shrub or small tree of the genus Bumelia
shrubby tree of the Pacific coast of the United States; yields cascara sagrada	a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments
	an Old World plantain with long narrow ribbed leaves widely established in temperate regions