Keyword Ability
A game term, such as "flying" or "haste," used as shorthand for a longer ability or group of abilities. See rule 702, "Keyword Abilities."

Keyword Action
A verb, such as "destroy" or "cast," used as a game term rather than as its normal English meaning. See rule 701, "Keyword Actions."

Kicker, Kicked
Kicker is a keyword ability that represents an optional additional cost. A spell has been kicked if its controller declared the intention to pay any or all of its kicker costs. See rule 702.32, "Kicker."