Loss is a type of Decline. Loss is a type of Failure. 
Side is related to Laughter. Joke can cause/lead to Laughter. Joke is related to Humor. Humor is related to Comedy. 
Decline <--IsA-- Loss --IsA--> Failure 
Side <--RelatedTo--> Laughter <--Causes-- Joke <--RelatedTo--> Humor <--RelatedTo--> Comedy 