Appointment is a synonym of Order. Order is related to Mess. Mess is related to Crowd. Crowd is related to Excessive. 
Stove is related to Heat. Iron entails/necessarily involves Heat. Iron is a type of Mineral. 
Appointment <--Synonym--> Order <--RelatedTo--> Mess <--RelatedTo--> Crowd <--RelatedTo--> Excessive 
Stove <--RelatedTo--> Heat <--Entails-- Iron --IsA--> Mineral 