Fee is a synonym of Tip. Tip is a synonym of Steer. Channel is a type of Steer. Channel is a type of Transmission. 
Photography is a type of Occupation. Occupation is related to Teacher. German is a type of Teacher. 
Fee <--Synonym--> Tip <--Synonym--> Steer <--IsA-- Channel --IsA--> Transmission 
Photography --IsA--> Occupation <--RelatedTo--> Teacher <--IsA-- German 