myxobacterium vs myxobacteria

myxobacterium and myxobacteria both are nouns.

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

As nouns, myxobacterium and myxobacteria are synonyms defined as:

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

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

myxobacterium (noun)	myxobacteria (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