The difference between C-hole and Sound hole
When used as nouns, c-hole means a sound hole, shaped like a lower-case c, through the top surface of a string instrument, whereas sound hole means an opening in the belly of a stringed instrument that increases its volume and enhances its tone quality.
check bellow for the other definitions of C-hole and Sound hole
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C-hole as a noun (musical instruments):
A sound hole, shaped like a lower-case c, through the top surface of a string instrument.
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Sound hole as a noun (music):
An opening in the belly of a stringed instrument that increases its volume and enhances its tone quality.