"vermin" in the noun sense
1. vermin, varmint
an irritating or obnoxious person
any of various small animals or insects that are pests e.g. cockroaches or rats
"cereals must be protected from mice and other vermin"
"he examined the child's head for vermin"
"boys in the village have probably been shooting vermin"
Source: WordNet® (An amazing lexical database of English)
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