Stage is the opposite of Screen. Screen is a synonym of Cover. Cover is the opposite of Page. Page is related to Unit. 
Trunk is related to Case. Case is related to Peel. 
Stage <--Antonym--> Screen <--Synonym--> Cover <--Antonym--> Page <--RelatedTo--> Unit 
Trunk <--RelatedTo--> Case <--RelatedTo--> Peel 