Drift is etymologically related to Drive. Drive is related to Test. Test is related to Short. Short is related to Minute. 
Pump entails/necessarily involves Pour. Pour is related to Fill. Fill is a different concept from Past. Past is related to Period. 
Drift --EtymologicallyRelatedTo--> Drive <--RelatedTo--> Test <--RelatedTo--> Short <--RelatedTo--> Minute 
Pump --Entails--> Pour <--RelatedTo--> Fill <--DistinctFrom--> Past <--RelatedTo--> Period 