you are likely to find Liver in/at/on Animal. Animal is related to Being. Being is the opposite of Wash. Wash is related to Do. 
Missionary is a type of Worker. Observer is a type of Worker. Observe is derived from Observer. Bird is a type of Observe. 
Liver --AtLocation--> Animal <--RelatedTo--> Being <--Antonym--> Wash <--RelatedTo--> Do 
Missionary --IsA--> Worker <--IsA-- Observer <--DerivedFrom-- Observe <--IsA-- Bird 