Nouns

(n)inside, interiorthe region that is inside of something
(n)inside, interiorthe inner or enclosed surface of something

Adjectives

(a)insiderelating to or being on the side closer to the center or within a defined space“he reached into his inside jacket pocket”, “inside out”, “an inside pitch is between home plate and the batter”
(s)insidebeing or applying to the inside of a building“an inside wall”
(s)inside, inner, privilegedconfined to an exclusive group“privy to inner knowledge”, “inside information”, “privileged information”
(s)insideaway from the outer edge“the inside lane”

Adverbs

(r)inside, indoorswithin a building“in winter we play inside”
(r)inside, withinon the inside“inside, the car is a mess”
(r)inwardly, insidewith respect to private feelings“inwardly, she was raging”
(r)at heart, at bottom, deep down, inside, in spite of appearancein reality“she is very kind at heart”