Face is the opposite of Back. Back is a type of Approve. Approve is etymologically related to Improve. 
Ski is a type of Runner. Snow would make you want to Ski. Snow is a different concept from Fire. 
Face <--Antonym--> Back --IsA--> Approve --EtymologicallyRelatedTo--> Improve 
Runner <--IsA-- Ski <--CausesDesire-- Snow <--DistinctFrom--> Fire 