Someone or something that smells, that detects scent(noun)
The nose(noun)
Something that has an unpleasant odor(noun)
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Use "smeller" in a sentence
"But some fart smeller is out there trying to solve the question, “what are they talking about, really, and more importantly, where did the conversation go?”"
"Or, as we used to say in high school, the smeller is the feller."
"Eye youse Tew bee a grate smeller, bud how by comptroller dust id fore mead."