Student is related to Education. Homework is part of Education. Homework is a type of Work. Service is a type of Work. 
Virtual is similar to Realistic. Realistic is related to Real. Real is the opposite of Ghost. Ghost is a synonym of Glimpse. 
Student <--RelatedTo--> Education <--PartOf-- Homework --IsA--> Work <--IsA-- Service 
Virtual <--SimilarTo--> Realistic <--RelatedTo--> Real <--Antonym--> Ghost <--Synonym--> Glimpse 