Pill is related to Vitamin. Vitamin is a type of Nutrient. Carbohydrate is a type of Nutrient. Carbohydrate is related to Diet. 
Bat is related to Big. Big is a synonym of Elder. Elder is related to Birthday. Birthday is the opposite of Half. 
Pill <--RelatedTo--> Vitamin --IsA--> Nutrient <--IsA-- Carbohydrate <--RelatedTo--> Diet 
Bat <--RelatedTo--> Big <--Synonym--> Elder <--RelatedTo--> Birthday <--Antonym--> Half 