Nouns

(n)outside, exteriorthe region that is outside of something
(n)outside, exteriorthe outer side or surface of something

Adjectives

(a)outsiderelating to or being on or near the outer side or limit“an outside margin”
(s)external, extraneous, outsidecoming from the outside“extraneous light in the camera spoiled the photograph”, “relying upon an extraneous income”, “disdaining outside pressure groups”
(s)outsideoriginating or belonging beyond some bounds“the outside world”, “outside interests”, “an outside job”
(a)outdoor, out-of-door, outsidelocated, suited for, or taking place in the open air“outdoor clothes”, “badminton and other outdoor games”, “a beautiful outdoor setting for the wedding”
(s)outsidefunctioning outside the boundaries or precincts of an organized unit“extramural hospital care and treatment”, “outside studies”
(s)outsideleading to or from the outside“an outside door”
(s)external, international, outsidefrom or between other countries“external commerce”, “international trade”, “developing nations need outside help”
(s)outside, remoteunlikely to occur“an outside chance”, “a remote possibility”, “a remote contingency”
(s)outsideon or toward an outer edge“the outside lane”, “an outside lane”
(s)away, outside(of a baseball pitch) on the far side of home plate from the batter“the pitch was away (or wide)”, “an outside pitch”

Adverbs

(r)outside, outdoors, out of doors, alfrescooutside a building“in summer we play outside”
(r)outsideon the outside“outside, the box is black”