We don't have synonyms for fusel oils yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are fuel oil, fusel oil and fuel oils.
(n) :
A mixture of several higher-order alcohols (having more than two carbon atoms) formed as byproduct in the normal fermentation process, captured as part of the tailings in distillation. An excessive concentration, as in low-quality moonshine, causes unpleasant taste.
(n) :
A mixture of several higher-order alcohols (having more than two carbon atoms) formed as byproduct in the normal fermentation process, captured as part of the tailings in distillation. An excessive concentration, as in low-quality moonshine, causes unpleasant taste.