Nail is a type of Attach. Nail is related to Bullet. Bullet is related to Food. Food is etymologically related to Foster. 
Serve is a synonym of Service. Service is related to Bank. Bank is related to Building. Building is related to Tree. 
Attach <--IsA-- Nail <--RelatedTo--> Bullet <--RelatedTo--> Food --EtymologicallyRelatedTo--> Foster 
Serve <--Synonym--> Service <--RelatedTo--> Bank <--RelatedTo--> Building <--RelatedTo--> Tree 