halobacteria vs halobacter

halobacteria and halobacter both are nouns.

Word	Noun	Adjective	Verb	Adverb
halobacteria	Yes	No	No	No
halobacter	Yes	No	No	No

As nouns, halobacteria and halobacter are synonyms defined as:

halobacteria and halobacter: halophiles in saline environments such as the Dead Sea or salt flats

Other synonyms of halobacteria include halobacterium.

halobacteria (noun)	halobacter (noun)
halophiles in saline environments such as the Dead Sea or salt flats	halophiles in saline environments such as the Dead Sea or salt flats