laver vs sea lettuce

laver and sea lettuce both are nouns.

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

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

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

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