Apology is related to Excuse. Excuse is related to Sorry. Sorry is related to Payment. Payment is related to Loan. 
Aim is a synonym of Struggle. Struggle is a type of Effort. Pull is a type of Effort. Pull is a synonym of Obtain. 
Apology <--RelatedTo--> Excuse <--RelatedTo--> Sorry <--RelatedTo--> Payment <--RelatedTo--> Loan 
Aim <--Synonym--> Struggle --IsA--> Effort <--IsA-- Pull <--Synonym--> Obtain 