penetration

As nouns the difference between incision and penetration

is that incision is incision, cut while penetration is penetration.

As nouns the difference between penetration and thrust

is that penetration is penetration while thrust is (fencing) an attack made by moving the sword parallel to its length and landing with the point.

As a verb thrust is

(lb) to make advance with.

As a noun penetration

is penetration.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between penetration and intrusion

is that penetration is penetration while intrusion is intrusion.

As nouns the difference between stick and penetration

is that stick is an elongated piece of wood or similar material, typically put to some use, for example as a wand or baton while penetration is the act of penetrating something.

As a verb stick

is to cut a piece of wood to be the stick member of a cope-and-stick joint.

As an adjective stick

is likely to stick; sticking, sticky.

As a proper noun Stick

is the Chapman Stick, an electric musical instrument devised by Emmett Chapman.