sea lettuce vs laver

sea lettuce and laver both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea lettuce	Yes	No	No	No
laver	Yes	No	No	No

As nouns, sea lettuce and laver are synonyms defined as:

sea lettuce and laver: seaweed with edible translucent crinkly green fronds

sea lettuce (noun)	laver (noun)
seaweed with edible translucent crinkly green fronds	(Old Testament) large basin used by a priest in an ancient Jewish temple to perform ritual ablutions
	seaweed with edible translucent crinkly green fronds
	edible red seaweeds