Bedroom is a synonym of Chamber. Chamber is a type of Assembly. Chapter is a type of Assembly. Chapter is a type of Club. 
Contribution is a type of Publication. Contribution is derived from Contribute. Contribute is a synonym of Aid. Aid is related to Soap. 
Bedroom <--Synonym--> Chamber --IsA--> Assembly <--IsA-- Chapter --IsA--> Club 
Publication <--IsA-- Contribution --DerivedFrom--> Contribute <--Synonym--> Aid <--RelatedTo--> Soap 