Instinct is a synonym of Impulse. Impulse is etymologically related to Pulse. Pulse is a type of Move. Move is related to Changing. 
Current is related to Pull. Pull is related to Horse. 
Instinct <--Synonym--> Impulse --EtymologicallyRelatedTo--> Pulse --IsA--> Move <--RelatedTo--> Changing 
Current <--RelatedTo--> Pull <--RelatedTo--> Horse 