Equivalent is related to Tea. Tea is related to Turn. Turn is related to Order. 
Cave can be used for Home. Cave is a synonym of Undermine. Undermine is a different concept from Assure. 
Equivalent <--RelatedTo--> Tea <--RelatedTo--> Turn <--RelatedTo--> Order 
Home <--UsedFor-- Cave <--Synonym--> Undermine <--DistinctFrom--> Assure 