Dress is related to Wedding. you are likely to find Wedding in/at/on Church. Church is etymologically related to Bury. Bury entails/necessarily involves Cover. 
Oak is a type of Plant. Oak is related to Barrel. 
Dress <--RelatedTo--> Wedding --AtLocation--> Church --EtymologicallyRelatedTo--> Bury --Entails--> Cover 
Plant <--IsA-- Oak <--RelatedTo--> Barrel 