As nouns the difference between master and overall
is that
master is (
l) (
original version of a document or of a recording) while
overall is (british) a garment worn over other clothing to protect it; a coverall or boiler suit a garment, for manual labor or for casual wear, often made of a single piece of fabric, with long legs and a bib upper, supported from the shoulders with straps, and having several large pockets and loops for carrying tools.
As an adjective overall is
all-encompassing, all around.
As an adverb overall is
generally; with everything considered.