Pile is a synonym of Lot. Lot is related to Estate. 
Approach is a synonym of Access. Access is related to Allow. Allow is a synonym of Sanction. Sanction is a synonym of Authorize. 
Pile <--Synonym--> Lot <--RelatedTo--> Estate 
Approach <--Synonym--> Access <--RelatedTo--> Allow <--Synonym--> Sanction <--Synonym--> Authorize 