Unite is the opposite of Divide. Divide is related to Line. Line is related to Answer. Answer is a type of Match. 
Circle is related to Form. Form is related to Little. Little is related to Boy. Boy is related to Hair. 
Unite <--Antonym--> Divide <--RelatedTo--> Line <--RelatedTo--> Answer --IsA--> Match 
Circle <--RelatedTo--> Form <--RelatedTo--> Little <--RelatedTo--> Boy <--RelatedTo--> Hair 