District is related to Voting. Voting is a synonym of Vote. Voter is derived from Vote. 
Lay is related to Sense. Scent is etymologically related to Sense. 
District <--RelatedTo--> Voting <--Synonym--> Vote <--DerivedFrom-- Voter 
Lay <--RelatedTo--> Sense <--EtymologicallyRelatedTo-- Scent 