Kit is a synonym of Outfit. Belt is part of Outfit. 
Steady is a synonym of Constant. Constant is the opposite of Variable. Variable is a type of Quantity. Quantity is a type of Concept. 
Kit <--Synonym--> Outfit <--PartOf-- Belt 
Steady <--Synonym--> Constant <--Antonym--> Variable --IsA--> Quantity --IsA--> Concept 