"rotter" in the noun sense
1. rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git
a person who is deemed to be despicable or contemptible
"only a rotter would do that"
"kill the rat"
"throw the bum out"
"you cowardly little pukes!"
"the British call a contemptible person a `git'"
Source: WordNet® (An amazing lexical database of English)
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