Extra
Part of speech: noun
Definition: A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundry an extra edition of a newspaper, which is printed outside of the normal printing cycle
Part of speech: adverb
Definition: To an extraordinary degree.
Part of speech: adjective
Definition: Beyond what is due, usual, expected, or necessary; additional; supernumerary. Extraordinarily good; superior; as extra work, extra pay.
Example sentence: Pressure can make a diamond. Pressure makes me play better because I don't want to let my teammates or my fans down, and that makes me play extra hard.
Additional
Part of speech: adjective
Definition: Supplemental or added to.
Example sentence: Dog - a kind of additional or subsidiary Deity designed to catch the overflow and surplus of the world's worship.