archeobacteria vs archaebacterium

archeobacteria and archaebacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
archeobacteria	Yes	No	No	No
archaebacterium	Yes	No	No	No

As nouns, archeobacteria and archaebacterium are synonyms defined as:

archeobacteria and archaebacterium: considered ancient life forms that evolved separately from bacteria and blue-green algae

Other synonyms of archeobacteria include archaebacteria, archaeobacteria.

archeobacteria (noun)	archaebacterium (noun)
considered ancient life forms that evolved separately from bacteria and blue-green algae	considered ancient life forms that evolved separately from bacteria and blue-green algae