Approach is a synonym of Access. Access is related to Allow. Allow is a synonym of Sanction. Sanction is a synonym of Authorize. 
Prosecutor is the opposite of Defense. Defense is a synonym of Account. Account is a synonym of Reply. Reply is related to Dog. 
Approach <--Synonym--> Access <--RelatedTo--> Allow <--Synonym--> Sanction <--Synonym--> Authorize 
Prosecutor <--Antonym--> Defense <--Synonym--> Account <--Synonym--> Reply <--RelatedTo--> Dog 