Endless is derived from End. Person does not want (to) End. Person does not want (to) Tragedy. Tragedy is related to Disaster. 
Population is related to Tribe. Tribe is the opposite of Organization. 
Endless --DerivedFrom--> End <--NotDesires-- Person --NotDesires--> Tragedy <--RelatedTo--> Disaster 
Population <--RelatedTo--> Tribe <--Antonym--> Organization 