As a noun catharsis

is (drama) a release of emotional tension after an overwhelming vicarious experience, resulting in the purging or purification of the emotions, as through watching a dramatic production (especially a tragedy).

As an adjective undefined is

lacking a definition or value.

As a noun perversion

is perversion.

As an adjective undefined is

lacking a definition or value.

As a noun undergrowth

is the plants in a forest which only reach a relatively low height (such as shrubs and bushes).

As an adjective undefined is

lacking a definition or value.

As a noun airlift

is the transportation of troops, civilians or supplies by air, especially in an emergency.

As a verb airlift

is to transport (troops etc) in an airlift.

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between palestinian and undefined

is that palestinian is of, from, or pertaining to palestine or the palestinian people while undefined is lacking a definition or value.

As a noun palestinian

is an inhabitant of palestine or an arab descending from that area.

As a verb collide

is to impact directly, especially if violent.

As an adjective undefined is

lacking a definition or value.

As a noun reprisal

is an act of retaliation.

As an adjective undefined is

lacking a definition or value.

As a noun adaptivity

is the state or quality of being adaptive; capacity to adapt.

As an adjective undefined is

lacking a definition or value.

As a noun slip

is briefs ; panties.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between invention and introduction

is that invention is while introduction is the act or process of introducing.