Power is a synonym of Ability. Reliability is derived from Ability. Reliability is related to Validity. 
Understanding is related to Get. Get is related to Give. Give is related to Donate. 
Power <--Synonym--> Ability <--DerivedFrom-- Reliability <--RelatedTo--> Validity 
Understanding <--RelatedTo--> Get <--RelatedTo--> Give <--RelatedTo--> Donate 