Use is a synonym of Tool. Tool is related to Fix. Fix is a synonym of Ready. Ready is related to Wear. 
Critical is a synonym of Crucial. Crucial is a synonym of Important. Important is the opposite of Light. Light is a synonym of Milk. 
Use <--Synonym--> Tool <--RelatedTo--> Fix <--Synonym--> Ready <--RelatedTo--> Wear 
Critical <--Synonym--> Crucial <--Synonym--> Important <--Antonym--> Light <--Synonym--> Milk 