Big is related to Sea. you are likely to find Seal in/at/on Sea. Machine can be used for Seal. 
you are likely to find Fan in/at/on South. South is a type of Region. Region is a synonym of Part. 
Big <--RelatedTo--> Sea <--AtLocation-- Seal <--UsedFor-- Machine 
Fan --AtLocation--> South --IsA--> Region <--Synonym--> Part 