Send is related to Communication. Writing can be used for Communication. Writing is related to Author. Book is created by Author. 
Profound is similar to Intense. Intense is a synonym of Severe. Severe is the opposite of Minor. Minor is similar to Secondary. 
Send <--RelatedTo--> Communication <--UsedFor-- Writing <--RelatedTo--> Author <--CreatedBy-- Book 
Profound <--SimilarTo--> Intense <--Synonym--> Severe <--Antonym--> Minor <--SimilarTo--> Secondary 