Echo is a type of Reply. Echo is a synonym of Ghost. Ghost is a type of Travel. Journey is a type of Travel. 
Electric is related to Engineer. you are likely to find Engineer in/at/on Vacation. Vacation is the opposite of Work. Work is related to Writing. 
Reply <--IsA-- Echo <--Synonym--> Ghost --IsA--> Travel <--IsA-- Journey 
Electric <--RelatedTo--> Engineer --AtLocation--> Vacation <--Antonym--> Work <--RelatedTo--> Writing 