Head is a type of Formation. Secondary is a type of Formation. Secondary is a different concept from Main. Main is a synonym of Strength. 
Lip is related to Round. Round is related to Cookie. 
Head --IsA--> Formation <--IsA-- Secondary <--DistinctFrom--> Main <--Synonym--> Strength 
Lip <--RelatedTo--> Round <--RelatedTo--> Cookie 