Activity is related to Watch. Watch is related to Measure. Measure is a synonym of Evaluate. Evaluate is a synonym of Assess. 
Level is related to Hill. Hill is related to Angle. 
Activity <--RelatedTo--> Watch <--RelatedTo--> Measure <--Synonym--> Evaluate <--Synonym--> Assess 
Level <--RelatedTo--> Hill <--RelatedTo--> Angle 