Grade is a type of Classify. Refer is a type of Classify. Refer is a synonym of Mention. Mention is a synonym of Cite. 
Degree is related to Award. Pension is a type of Award. Pension is similar to Retire. 
Grade --IsA--> Classify <--IsA-- Refer <--Synonym--> Mention <--Synonym--> Cite 
Degree <--RelatedTo--> Award <--IsA-- Pension <--SimilarTo--> Retire 