Kickoff and Walk-up

Kickoff noun - The point at which something begins.

Walk-up and kickoff are semantically related In some cases you can use "Walk-up" instead a noun "Kickoff".

Walk-up noun - An apartment building without an elevator.

Kickoff and walk-up are semantically related in short preliminary event topic. Sometimes you can use "Kickoff" instead a noun phrase "Walk-up".