Fit is related to Sound. Sound is related to Accurate. Accurate is a synonym of Sharp. Sharp is a synonym of Harsh. 
Skill is related to Talent. Talent is related to Quality. Difference is a type of Quality. 
Fit <--RelatedTo--> Sound <--RelatedTo--> Accurate <--Synonym--> Sharp <--Synonym--> Harsh 
Skill <--RelatedTo--> Talent <--RelatedTo--> Quality <--IsA-- Difference 