76 entries under noun topic. ×

19
virus(disease, bug, toxin, venom)
15
germ(bug, toxin, venom, microorganism)
12
bacterium(disease, bug, mold, leaven)
11
bug
10
microbe(littleness, microorganism)
9
bacillus(germ, microorganism)
8
germs
8
microbes
8
microorganism
7
animalcule(littleness, microorganism)
6
bacilli
6
microorganisms
6
protozoa(microorganism, microorganisms)
5
amoeba
5
dyad
5
microspore
5
paramecium
5
zoospore
2
microphyte
2
parasite
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APASmart Define. (2016). bacteria thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/bacteria/thesaurus/synonyms
ChicagoSmart Define. 2016. "bacteria thesaurus" https://smartdefine.org/bacteria/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, bacteria thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/bacteria/thesaurus/synonyms>.
MLASmart Define. "bacteria thesaurus" 8 March 2016. Web. 26 September 2026. <https://smartdefine.org/bacteria/thesaurus/synonyms>