Amount is related to Concept. Concept is a synonym of Conception. 
Might is a synonym of Power. Powerful is derived from Power. Powerful is related to Effective. Effective is related to Efficient. 
Amount <--RelatedTo--> Concept <--Synonym--> Conception 
Might <--Synonym--> Power <--DerivedFrom-- Powerful <--RelatedTo--> Effective <--RelatedTo--> Efficient 