Spread is the opposite of Gather. Gather is related to Hunting. Bullet can be used for Hunting. Bullet is related to Small. 
Substantial is similar to Sound. Sound is related to Projection. 
Spread <--Antonym--> Gather <--RelatedTo--> Hunting <--UsedFor-- Bullet <--RelatedTo--> Small 
Substantial <--SimilarTo--> Sound <--RelatedTo--> Projection 