bioremediation vs bacterium

bioremediation and bacterium both are nouns.

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

bioremediation (noun)	bacterium (noun)
the act of treating waste or pollutants by the use of microorganisms (as bacteria) that can break down the undesirable substances	(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
the branch of biotechnology that uses biological process to overcome environmental problems