Class is a synonym of Year. Year is related to Summer. Summer is related to Hot. Hot is similar to Eager. 
Cab is a type of Car. Car is related to Park. Park is related to Bench. 
Class <--Synonym--> Year <--RelatedTo--> Summer <--RelatedTo--> Hot <--SimilarTo--> Eager 
Cab --IsA--> Car <--RelatedTo--> Park <--RelatedTo--> Bench 