140 entries under noun topic. ×

22
virus(illness, bug, death, toxin)
19
microbe(illness, sickness, bug, beings)
15
bug(informal, illness, sickness, beings)
14
origin(cause, beginning, source, basis)
13
seed(cause, start, influence, base)
12
bud(cause, start, plant, beginning)
12
egg(cause, influence, connection, beginning)
12
nucleus(quality, cause, start, character)
11
source(cause, start, base, beginning)
10
bacteria(microorganism, micro-organism)
10
embryo(cause, start, influence, base)
10
root(quality, cause, character, spirit)
8
bacterium(illness, unit, sickness, bug)
7
bacillus(illness, sickness, microorganism, bacteria)
7
beginning(cause, start, base, stone)
7
microorganism(illness, unit, sickness, bug)
7
rudiment(cause, beginning, stone, source)
6
cause(plan, influence, beginning, source)
6
inception(cause, influence, beginning, source)
6
start(cause, base, beginning, stone)
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APASmart Define. (2016). germ thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/germ/thesaurus/synonyms
ChicagoSmart Define. 2016. "germ thesaurus" https://smartdefine.org/germ/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, germ thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/germ/thesaurus/synonyms>.
MLASmart Define. "germ thesaurus" 14 March 2016. Web. 26 September 2026. <https://smartdefine.org/germ/thesaurus/synonyms>