Come in and Tune in

Come in verb - To come or go into.

Tune in and come in are semantically related In some cases you can use "Tune in" instead a verb "Come in".

Tune in verb - Regulate (a radio or television set) in order to receive a certain station or program.

Come in and tune in are semantically related in take part in activity topic. Sometimes you can use "Come in" instead a verb "Tune in".