Guard is related to Employee. Employee is derived from Employ. Employ is related to Take. Take is a synonym of Grip. 
Animal is related to Nest. Nest is related to Living. Living can cause/lead to Pollution. 
Guard <--RelatedTo--> Employee --DerivedFrom--> Employ <--RelatedTo--> Take <--Synonym--> Grip 
Animal <--RelatedTo--> Nest <--RelatedTo--> Living --Causes--> Pollution 