halobacter vs halobacterium

halobacter and halobacterium both are nouns.

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

As nouns, halobacter and halobacterium are synonyms defined as:

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

Other synonyms of halobacter include halobacteria.

halobacter (noun)	halobacterium (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