A feat power is a power granted by a feat.
Divinity feat powers[]
Feat powers tied to individual deities require the use of the Channel Divinity class feature, which is only available to the avenger, cleric, invoker, and paladin classes. A character can use one channel divinity power once per encounter, regardless of how many channel divinity powers the character knows.
Weapon feat powers[]
Some feats allow a character to swap a class power for a feat power involving a particular type of weapon.