Shared is a synonym of Common. Common is the opposite of Unique. Unique is a different concept from Ordinary. Ordinary is a synonym of Normal. 
you are likely to find Shark in/at/on Museum. Shark is related to Sea. Sea is the opposite of Coast. Coast is related to Map. 
Shared <--Synonym--> Common <--Antonym--> Unique <--DistinctFrom--> Ordinary <--Synonym--> Normal 
Museum <--AtLocation-- Shark <--RelatedTo--> Sea <--Antonym--> Coast <--RelatedTo--> Map 