We found one dictionary that defines the word coarseners:

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1. coarseners: Wiktionary

Opposite: refiners, purifiers, cleansers ▸ Words similar to coarseners ▸ Usage examples for coarseners ▸ Idioms related to coarseners ▸ Wikipedia articles (New!) ▸ Words that often appear near coarseners ▸ Rhymes of coarseners ▸ Invented words related to coarseners