chlorella vs algae

chlorella and algae both are nouns.

Word	Noun	Adjective	Verb	Adverb
chlorella	Yes	No	No	No
algae	Yes	No	No	No

As nouns, algae is a hypernym of chlorella; that is, algae is a word with a broader meaning than chlorella:

chlorella: any alga of the genus Chlorella
algae: primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves

Other hypernyms of chlorella include alga.

chlorella (noun)	algae (noun)
any alga of the genus Chlorella	primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves