Organ is a type of Agency. Agency is related to Cross. Cross is the opposite of Pleased. Pleased is a form of Please. 
Couch is related to Seat. Sofa is a type of Seat. Sofa can be used for Fucking. 
Organ --IsA--> Agency <--RelatedTo--> Cross <--Antonym--> Pleased --FormOf--> Please 
Couch <--RelatedTo--> Seat <--IsA-- Sofa --UsedFor--> Fucking 