saltwort vs kelpwort

saltwort and kelpwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
saltwort	Yes	No	No	No
kelpwort	Yes	No	No	No

As nouns, saltwort and kelpwort are synonyms defined as:

saltwort and kelpwort: bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash

Other synonyms of saltwort include barilla, glasswort, kali, Salsola kali, Salsola soda.

saltwort (noun)	kelpwort (noun)
low-growing strong-smelling coastal shrub of warm parts of the New World having unisexual flowers in conelike spikes and thick succulent leaves	bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash
bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash