green algae vs laver

green algae and laver both are nouns.

Word	Noun	Adjective	Verb	Adverb
green algae	Yes	No	No	No
laver	Yes	No	No	No

As nouns, laver is a hyponym of green algae; that is, laver is a word with a more specific, narrower meaning than green algae:

green algae: algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water
laver: seaweed with edible translucent crinkly green fronds

Other hyponyms of green algae include sea lettuce, pond scum, spirogyra, stonewort, desmid.

green algae (noun)	laver (noun)
algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water	(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