Thanks is etymologically related to Thought. Thought is related to Decide. Decide is related to Decision. Decision is related to Committee. 
Sector is part of Economy. Business is a type of Sector. Business is the opposite of Nonprofit. 
Thanks --EtymologicallyRelatedTo--> Thought <--RelatedTo--> Decide <--RelatedTo--> Decision <--RelatedTo--> Committee 
Economy <--PartOf-- Sector <--IsA-- Business <--Antonym--> Nonprofit 