13
virus(noun, illness, sickness, bug, germ)
11
microbe(noun, illness, sickness, germ, microorganism)
10
germ(noun, illness, sickness, microorganism, bacteria)
9
bacterium(noun, illness, sickness, germ, microorganism)
7
bacteria(noun, bug, microorganism)
5
bacilli
5
bug(noun, illness, sickness, germ, microorganism)
4
B
4
microorganism(noun, illness, sickness, germ, microorganism)
3
amoeba(noun, microorganism)
3
pathogen
3
protozoa(noun, microorganism)
1
adenovirus
1
aerobe
1
aerobic bacteria
1
amebic
1
anaerobe
1
anaerobic bacteria
1
animalcule(noun, microorganism)
1
bacillary
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APASmart Define. (2015). bacillus thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/bacillus/thesaurus/synonyms
ChicagoSmart Define. 2015. "bacillus thesaurus" https://smartdefine.org/bacillus/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, bacillus thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/bacillus/thesaurus/synonyms>.
MLASmart Define. "bacillus thesaurus" 10 December 2015. Web. 21 September 2026. <https://smartdefine.org/bacillus/thesaurus/synonyms>