Converse of object

• crack: Cracking Cracking is one of the most important reactions in the petroleum industry.

Modifies a noun

• code: Further reading You can learn more about quantum information in the Plus articles In a spin and Cracking codes, part II.

Noun used with modifier

• password: Password cracking does not require anything to be sent on the wire as intruder's own machine is being used to authenticate your password.

• surface: SURFACE CRACKING TO THE FACE OF THE BLADE CAUSE: General wear and tear.