microorganism (n.)
- adenovirus
- aerobe
- amoeba
- anaerobe
- animalcule
- bacillus
- bacteria
- bacterium
- being
- bug
- coccus
- creature
- crumb
- diatom
- dot
- drop
- droplet
- dyad
- echovirus
- enterovirus
- flagellate
- fleck
- flyspeck
- fungus
- germ
- gnat
- grain
- individual
- iota
- jot
- microbe
- microspore
- midge
- minim
- minutia
- mite
- mold
- monad
- mote
- nematode
- ont
- organism
- organization
- paramecium
- particle
- pathogen
- picornavirus
- pinhead
- pinpoint
- point
- protozoa
- protozoon
- reovirus
- rhinovirus
- rickettsia
- salmonella
- saprophyte
- scrap
- snip
- snippet
- speck
- spirillum
- spirochete
- spore
- staphylococcus
- streptococcus
- tetrad
- tittle
- triad
- vibrio
- virus
- volvox
- zooid
- zoon
- zoospore
