Compose is a synonym of Frame. Frame is a type of Part. Part is related to Engine. you are likely to find Rod in/at/on Engine. 
Melt is related to Cheese. Cheese is a type of Food. 
Compose <--Synonym--> Frame --IsA--> Part <--RelatedTo--> Engine <--AtLocation-- Rod 
Melt <--RelatedTo--> Cheese --IsA--> Food 