Contribution is a type of Sum. Sum is a synonym of Summary. Argument is a type of Summary. Argument is related to Dispute. 
Room is the opposite of Cell. Cell is related to Mobile. 
Contribution --IsA--> Sum <--Synonym--> Summary <--IsA-- Argument <--RelatedTo--> Dispute 
Room <--Antonym--> Cell <--RelatedTo--> Mobile 