In british|lang=en terms the difference between gaslight and gaslight

is that gaslight is (british) a lamp which operates by burning gas while gaslight is (british) a lamp which operates by burning gas.

In slang|lang=en terms the difference between gaslight and gaslight

is that gaslight is (slang) to manipulate someone psychologically such that they question their own sanity while gaslight is (slang) to manipulate someone psychologically such that they question their own sanity.

As nouns the difference between gaslight and gaslight

is that gaslight is (british) the light produced by burning piped illuminating gas while gaslight is (british) the light produced by burning piped illuminating gas.

As verbs the difference between gaslight and gaslight

is that gaslight is (slang) to manipulate someone psychologically such that they question their own sanity while gaslight is (slang) to manipulate someone psychologically such that they question their own sanity.