Use is related to Soap. Soap is the opposite of Water. Water is related to Shell. Shell is a type of Housing. 
Fellow is a different concept from Mate. Mate is a synonym of Teammate. 
Use <--RelatedTo--> Soap <--Antonym--> Water <--RelatedTo--> Shell --IsA--> Housing 
Fellow <--DistinctFrom--> Mate <--Synonym--> Teammate 