Seat is a type of Accommodate. Seat is related to Pant. Pant is a synonym of Breath. 
Relax is the opposite of Stretch. Stretch is related to Flexible. Flexible is a synonym of Plastic. 
Accommodate <--IsA-- Seat <--RelatedTo--> Pant <--Synonym--> Breath 
Relax <--Antonym--> Stretch <--RelatedTo--> Flexible <--Synonym--> Plastic 