Associate is a synonym of Join. Join is related to Union. 
Word is a type of Statement. you are likely to find Word in/at/on Book. Book is related to Bind. Bind is a type of Relate. 
Associate <--Synonym--> Join <--RelatedTo--> Union 
Statement <--IsA-- Word --AtLocation--> Book <--RelatedTo--> Bind --IsA--> Relate 