Church is etymologically related to Bury. Bury is related to Ground. you are likely to find Pond in/at/on Ground. Mere is a type of Pond. 
Command is a type of Authority. 
Church --EtymologicallyRelatedTo--> Bury <--RelatedTo--> Ground <--AtLocation-- Pond <--IsA-- Mere 
Authority <--IsA-- Command 