Serious is related to Drama. Drama is a different concept from Comedy. Comedy is the opposite of Horror. 
Progressive is similar to Liberal. Liberty is etymologically related to Liberal. Liberty is related to Lady. Lady is related to Miss. 
Serious <--RelatedTo--> Drama <--DistinctFrom--> Comedy <--Antonym--> Horror 
Progressive <--SimilarTo--> Liberal <--EtymologicallyRelatedTo-- Liberty <--RelatedTo--> Lady <--RelatedTo--> Miss 