probiotic flora vs probiotic bacterium

probiotic flora and probiotic bacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
probiotic flora	Yes	No	No	No
probiotic bacterium	Yes	No	No	No

As nouns, probiotic flora and probiotic bacterium are synonyms defined as:

probiotic flora and probiotic bacterium: a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant

Other synonyms of probiotic flora include probiotic, probiotic microflora.

probiotic flora (noun)	probiotic bacterium (noun)
a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant	a beneficial bacterium found in the intestinal tract of healthy mammals; often considered to be a plant