swamp locust vs water locust

swamp locust and water locust both are nouns.

Word	Noun	Adjective	Verb	Adverb
swamp locust	Yes	No	No	No
water locust	Yes	No	No	No

As nouns, swamp locust and water locust are synonyms defined as:

swamp locust and water locust: honey locust of swamps and bottomlands of southern United States having short oval pods; yields dark heavy wood

Other synonyms of swamp locust include Gleditsia aquatica.

swamp locust (noun)	water locust (noun)
honey locust of swamps and bottomlands of southern United States having short oval pods; yields dark heavy wood	honey locust of swamps and bottomlands of southern United States having short oval pods; yields dark heavy wood