We don't have synonyms for conch yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are coach, cinch and couch.
(n) :
a marine mollusc of the family Strombidae which lives in its own spiral shell; the shell of this sea animal
(v) :
to refine the flavour and texture of chocolate by warming and grinding, either in a traditional concher, or between rollers; to play a conch seashell as a musical instrument, by blowing through a hole made close to the origin of the spiral
(n) :
a marine mollusc of the family Strombidae which lives in its own spiral shell; the shell of this sea animal
(v) :
to refine the flavour and texture of chocolate by warming and grinding, either in a traditional concher, or between rollers; to play a conch seashell as a musical instrument, by blowing through a hole made close to the origin of the spiral