Offshoot and Rake-off

Offshoot noun - A branch of a main stem especially of a plant.

Rake-off and offshoot are semantically related In some cases you can use "Rake-off" instead a noun "Offshoot".

Rake-off noun - A percentage (of winnings or loot or profit) taken by an operator or gangster.

Offshoot and rake-off are semantically related in something produced from separating topic. Sometimes you can use "Offshoot" instead a noun phrase "Rake-off".