Kickoff-Kick-Off | Commonly Confused Words

Kickoff

/'kɪkɔf/

The start or beginning of something, especially a game or event

/ˈkɪk ˈɒf/

To start something, especially an event or a process

Kickoff is one word and is often used as a noun.
Kick off is two words and is commonly used as a verb phrase.
If you are talking about starting an event or the beginning of a match, use kickoff.
If you are describing the action of starting something, use kick off.
Remember that a kick off consists of two actions: the kicking (verb) and the power behind it (the preposition off).