Motivation is a synonym of Motive. Motive is related to Prove. Prove is related to Define. one thing you do when you Writing is Define. 
Ally is a type of Associate. Ally is related to Diplomatic. 
Motivation <--Synonym--> Motive <--RelatedTo--> Prove <--RelatedTo--> Define <--HasSubevent-- Writing 
Associate <--IsA-- Ally <--RelatedTo--> Diplomatic 