As proper nouns the difference between gan and gal

is that gan is one of the major divisions of the Chinese language spoken in the Jiangxi province while Gal is alternative form of Gal.|lang=en.

As a verb gan

is simple past of gin.

As a noun gal is

a gallon.

As a symbol Gal is

the symbol for the cgs unit of acceleration, gal or galileo.

As an initialism GAL is

guardian Ad Litem, an individual (often a lawyer) appointed to represent the best interests of a child or incapacitated person for the purpose of a legal procedure.