Leadoff and Onset

Leadoff adjective - Coming before all others in time or order.

Onset and leadoff are semantically related. in beginning topic. In some cases you can use "Onset" instead a noun "Leadoff".

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

Leadoff and onset are semantically related. Sometimes you can use "Leadoff" instead a noun "Onset".