Grant is etymologically related to Credit. Grant is a synonym of Allow. Allow is related to Action. Action is related to Escape. 
Possible is a synonym of Option. Option is a synonym of Choice. Vote is a type of Choice. Voter is derived from Vote. 
Credit <--EtymologicallyRelatedTo-- Grant <--Synonym--> Allow <--RelatedTo--> Action <--RelatedTo--> Escape 
Possible <--Synonym--> Option <--Synonym--> Choice <--IsA-- Vote <--DerivedFrom-- Voter 