Fit is a type of Form. Fit is a synonym of Equip. Stock is a type of Equip. Stock is a synonym of Inventory. 
Required is related to Carbon. Food is made of Carbon. Food is related to Glad. Glad is related to Satisfy. 
Form <--IsA-- Fit <--Synonym--> Equip <--IsA-- Stock <--Synonym--> Inventory 
Required <--RelatedTo--> Carbon <--MadeOf-- Food <--RelatedTo--> Glad <--RelatedTo--> Satisfy 