As verbs the difference between shining and flashing
is that
shining is present participle of lang=en while
flashing is present participle of lang=en.
As nouns the difference between shining and flashing
is that
shining is a bright emission of light; a gleam while
flashing is components used to weatherproof or seal roof system edges at perimeters, penetrations, walls, expansion joints, valleys, drains and other places where the roof covering is interrupted or terminated.
As an adjective shining
is emitting light.