cyanobacteria vs cyanobacterial

cyanobacteria is a noun but cyanobacterial is not a noun.

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

cyanobacteria (noun)	cyanobacterial (noun)
predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton

cyanobacteria (adjective)	cyanobacterial (adjective)
	relating to or caused by photosynthetic bacteria of the class Cyanobacteria