Here are the differences in Butterflies and Moths. However, there are exceptions to each 'rule'. To read more you can go to the link below where I found the info.
Moths rest with their wings out to their sides. Butterflies fold their wings above their backs when they perch. Sometimes butterflies 'sit' with their wings spread for short periods of time.
Moths have stout and furry-looking bodies, while butterflies have slender and smoother abdomens. Moths have larger scales on their wings that make them look fatter. Butterflies have fine scales.
Most moths are nocturnal while most butterflies are about in the day time.
Butterflies have bright colors on their wings. Nocturnal moths are usually plain brown, gray, white or black and often with patterns of zigzags or swirls that help camouflage them during the day.
The most obvious difference is in the antennae. Butterflies have thin slender filamentous antennae which are club shaped at the end. Moths have comb-like or feathery antennae, and not club shaped.
Moths have a filament from the hind wing and coupling with barbs on the fore wing. Butterflies don't have these.
Moth caterpillars spin a cocoon made of silk where they metamorphose into the pupal stage. Most butterflies form an exposed pupa, also termed a chrysalis.