amoeba (n.)
- adenovirus
- aerobe
- anaerobe
- animalcule
- bacillus
- bacteria
- bacterium
- bug
- coccus
- diatom
- dyad
- echovirus
- enterovirus
- flagellate
- fungus
- germ
- microbe
- microorganism
- microspore
- mold
- monad
- nematode
- paramecium
- pathogen
- picornavirus
- protozoa
- protozoon
- reovirus
- rhinovirus
- rickettsia
- salmonella
- saprophyte
- spirillum
- spirochete
- spore
- staphylococcus
- streptococcus
- tetrad
- triad
- vibrio
- virus
- volvox
- zoospore