One who gazes.

plural of gazer

(medical slang) A radiologist.

plural of shadow gazer

plural of navel-gazer

(derogatory) One who engages in navel-gazing; a person who is introspective to the point of self-obsession.

Someone who claims to be able to see the future by gazing into a crystal ball. / (figuratively) Someone who makes predictions about the future, especially when these are seen as speculative.