Allegation is a type of Claim. Contend is a type of Claim. Contend is a synonym of Oppose. Oppose is the opposite of Recommend. 
Allow is a synonym of Own. Own is related to Rich. 
Allegation --IsA--> Claim <--IsA-- Contend <--Synonym--> Oppose <--Antonym--> Recommend 
Allow <--Synonym--> Own <--RelatedTo--> Rich 