Initial is the opposite of Final. Final is related to Result. Result is related to Disease. Corn is a type of Disease. 
Additional is related to Interest. Interest is a synonym of Sake. Sake is a type of Purpose. 
Initial <--Antonym--> Final <--RelatedTo--> Result <--RelatedTo--> Disease <--IsA-- Corn 
Additional <--RelatedTo--> Interest <--Synonym--> Sake --IsA--> Purpose 