Quest is a type of Chase. Acquire is etymologically related to Quest. Acquire is related to Adopt. Adopt is a synonym of Follow. 
Ease is a different concept from Difficult. Difficult is a synonym of Hard. 
Chase <--IsA-- Quest <--EtymologicallyRelatedTo-- Acquire <--RelatedTo--> Adopt <--Synonym--> Follow 
Ease <--DistinctFrom--> Difficult <--Synonym--> Hard 