catechu vs acacia

catechu and acacia both are nouns.

Word	Noun	Adjective	Verb	Adverb
catechu	Yes	No	No	No
acacia	Yes	No	No	No

As nouns, acacia is a hypernym of catechu; that is, acacia is a word with a broader meaning than catechu:

catechu: East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu
acacia: any of various spiny trees or shrubs of the genus Acacia

catechu (noun)	acacia (noun)
East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu	any of various spiny trees or shrubs of the genus Acacia
extract of the heartwood of Acacia catechu used for dyeing and tanning and preserving fishnets and sails; formerly used medicinally