myxobacteria vs myxobacterium

myxobacteria and myxobacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
myxobacteria	Yes	No	No	No
myxobacterium	Yes	No	No	No

As nouns, myxobacteria and myxobacterium are synonyms defined as:

myxobacteria and myxobacterium: bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste

Other synonyms of myxobacteria include gliding bacteria, myxobacter, slime bacteria.

myxobacteria (noun)	myxobacterium (noun)
bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste	bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste