same; identical; one and the same; indicates that the two compared noun clauses both represent the one thing; similar; alike; practically identical; indicates that the two compared noun clauses have one or more matching qualities; self; emphasizes the identity or singularity of the modified noun phrase; own; emphasizes the owner or the exclusivity of ownership in a noun phrase with a possessive pronoun
mysterious; mystery (e.g. mystery lover [in an affair], mystery man or woman [in a case or investigation]); eerie (e.g. an eerie place, an eerie air or glow, eerie music); uncanny (e.g. uncanny knowledge or ability)