nostoc vs cyanobacteria

nostoc and cyanobacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
nostoc	Yes	No	No	No
cyanobacteria	Yes	No	No	No

As nouns, cyanobacteria is a hypernym of nostoc; that is, cyanobacteria is a word with a broader meaning than nostoc:

nostoc: found in moist places as rounded jellylike colonies
cyanobacteria: predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton

Other hypernyms of nostoc include blue-green algae.

nostoc (noun)	cyanobacteria (noun)
found in moist places as rounded jellylike colonies	predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton