Tour is a synonym of Travel. Travel is a synonym of Trip. 
Increase is a synonym of Build. Build is the opposite of Weaken. Slow is a type of Weaken. Slow is the opposite of Prompt. 
Tour <--Synonym--> Travel <--Synonym--> Trip 
Increase <--Synonym--> Build <--Antonym--> Weaken <--IsA-- Slow <--Antonym--> Prompt 