As nouns the difference between execution and stay
is that execution
is the act, manner or style of executing (actions, maneuvers, performances) while stay
is (nautical) a strong rope supporting a mast, and leading from the head of one mast down to some other, or other part of the vessel or stay
can be a prop; a support.
As a verb stay is
(nautical) to incline forward, aft, or to one side by means of stays or stay
can be to prop; support; sustain; hold up; steady.
As a adjective stay is
As a adverb stay is