probiotic microflora vs probiotic bacterium

probiotic microflora and probiotic bacterium both are nouns.

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

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

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

Other synonyms of probiotic microflora include probiotic, probiotic flora.

probiotic microflora (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