Protect is a type of Defend. you would Fence because Defend. Fence is a synonym of Barrier. 
Merit is related to Good. Good is related to Plate. Plate is related to Recipient. Host is a type of Recipient. 
Protect --IsA--> Defend <--MotivatedByGoal-- Fence <--Synonym--> Barrier 
Merit <--RelatedTo--> Good <--RelatedTo--> Plate <--RelatedTo--> Recipient <--IsA-- Host 