Overwhelming is derived from Overwhelm. Seize is a type of Overwhelm. Get is a type of Seize. Get is related to Acquisition. 
Casual is the opposite of Formal. Formal is related to Organization. Corporation is a type of Organization. 
Overwhelming --DerivedFrom--> Overwhelm <--IsA-- Seize <--IsA-- Get <--RelatedTo--> Acquisition 
Casual <--Antonym--> Formal <--RelatedTo--> Organization <--IsA-- Corporation 