Sheer is a type of Steer. Steer is a synonym of Handle. Handle is related to Pick. Pick is the opposite of Give. 
Natural is related to Herb. Herb is related to Alternative. 
Sheer --IsA--> Steer <--Synonym--> Handle <--RelatedTo--> Pick <--Antonym--> Give 
Natural <--RelatedTo--> Herb <--RelatedTo--> Alternative 