Fast is related to Like. Only is etymologically related to Like. Only is related to Individual. Individual is related to Alone. 
Side is related to Comparison. Contrast is a type of Comparison. Contrast is a type of Opposition. Opposition is related to Rebel. 
Fast <--RelatedTo--> Like <--EtymologicallyRelatedTo-- Only <--RelatedTo--> Individual <--RelatedTo--> Alone 
Side <--RelatedTo--> Comparison <--IsA-- Contrast --IsA--> Opposition <--RelatedTo--> Rebel 