Silent is the opposite of Scream. one thing you do when you Shot is Scream. Shot is related to Wound. Wound is related to Medical. 
Sales is related to Boat. Sail is a type of Boat. 
Silent <--Antonym--> Scream <--HasSubevent-- Shot <--RelatedTo--> Wound <--RelatedTo--> Medical 
Sales <--RelatedTo--> Boat <--IsA-- Sail 