Grip is a type of Seize. Grip is the opposite of Blade. Blade is related to Instrument. Instrument is related to Eye. 
Grass is related to Content. Content is related to Glad. 
Seize <--IsA-- Grip <--Antonym--> Blade <--RelatedTo--> Instrument <--RelatedTo--> Eye 
Grass <--RelatedTo--> Content <--RelatedTo--> Glad 