Camp is related to Cottage. Cottage is related to Cheese. Cheese is related to Smile. 
Excuse is a synonym of Apologize. Plead is a type of Apologize. Plead is related to Beg. Beg is a synonym of Pray. 
Camp <--RelatedTo--> Cottage <--RelatedTo--> Cheese <--RelatedTo--> Smile 
Excuse <--Synonym--> Apologize <--IsA-- Plead <--RelatedTo--> Beg <--Synonym--> Pray 