microorganism vs bacterium

bacterium vs microorganism

microorganism and bacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
microorganism	Yes	No	No	No
bacterium	Yes	No	No	No

As nouns, bacterium is a hyponym of microorganism; that is, bacterium is a word with a more specific, narrower meaning than microorganism:

microorganism: any organism of microscopic size
bacterium: (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants

Other hyponyms of microorganism include monad, intestinal flora, virus, moneran, moneron, bacteria, bug, germ, microbe, pathogen, protoctist, protist, protistan, microflora.

microorganism (noun)	bacterium (noun)
any organism of microscopic size	(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants

Difference between microorganism and bacterium

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