Buddy is a synonym of Mate. Mate is related to Fork. Fork is the opposite of Spoon. 
Person is the opposite of Crowd. Crowd is related to Interesting. Interesting is similar to Fascinating. 
Buddy <--Synonym--> Mate <--RelatedTo--> Fork <--Antonym--> Spoon 
Person <--Antonym--> Crowd <--RelatedTo--> Interesting <--SimilarTo--> Fascinating 