Onset and Takeoff

Onset noun - The act or action of setting upon with force or violence.

Takeoff and onset are semantically related in commencement topic. In some cases you can use "Takeoff" instead a noun "Onset".

Takeoff noun - A rising from a surface at the start of a flight (as of a rocket).

Onset and takeoff are semantically related in commencement topic. Sometimes you can use "Onset" instead a noun "Takeoff".