Flat is the opposite of Wave. Wave is related to Heat. Heat is related to Shade. Shade is a different concept from Burning. 
Leave is a synonym of Result. Result is a synonym of Follow. Follow is related to Go. Go is the opposite of Stay. 
Flat <--Antonym--> Wave <--RelatedTo--> Heat <--RelatedTo--> Shade <--DistinctFrom--> Burning 
Leave <--Synonym--> Result <--Synonym--> Follow <--RelatedTo--> Go <--Antonym--> Stay 