Etymology
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Words related to -eer

-ary 
adjective and noun word-forming element, in most cases from Latin -arius, -aria, -arium "connected with, pertaining to; the man engaged in," from PIE relational adjective suffix *-yo- "of or belonging to." The neuter of the adjectives in Latin also were often used as nouns (solarium "sundial," vivarium, honorarium, etc.). It appears in words borrowed from Latin in Middle English. In later borrowings from Latin to French, it became -aire and passed into Middle English as -arie, subsequently -ary.
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-ier 
word-forming element indicating "one whose occupation has to do with," from French and Old French -ier, from Latin -arius (see -ary). Nativized and used to form English words (glazier, hosier, etc.) Also see -yer, and compare -eer.
auctioneer (n.)
1708, "one whose business is to offer goods or property for sale by auction," from auction (n.) + -eer. From 1733 as a verb, "to sell by auction." Related: Auctioneering.
gazetteer (n.)
1610s, "journalist," from gazette (n.) + -eer. Meaning "geographical dictionary" is from 1704, from Laurence Eachard's 1693 geographical handbook for journalists, "The Gazetteer's, or Newsman's, Interpreter," second edition simply titled "The Gazetteer."
mountaineer (n.)

c. 1600, "native of or dweller in mountains," from mountain + -eer or from French montanier. The verb meaning "to be a mountain-climber" is from 1803 (compare electioneer). Related: Mountaineering

musketeer (n.)
"soldier armed with a musket," 1580s, from musket + -eer, or else from French mousquetaire, from mousquette (see musket).
pamphleteer 

1640s as a noun, "a writer of pamphlets," from pamphlet + -eer. As a verb, "to write and issue pamphlets," from 1690s. Related: Pamphleteering.

profiteer (v.)

"to make excessive gains, as by the sale of necessary goods at extortionate prices," 1797, but dormant in English until it was revived early 20c. and popularized in World War I, from profit + -eer. From 1912 as a noun. Related: Profiteering (1814).

Or is it simply hysteria which produces what is to-day termed "the profiteer?" It is probable that the modern profiteer is the same person whom we formerly called "the grafter, the extortioner, the robber, the gouger." [Legal Aid Review, April 1920]
puppeteer (n.)

"one who manages the motions of puppets," 1915, from puppet + -eer. Earlier in the same sense were puppetman (1731); puppet-player (1550s), which also could mean "a mime."

racketeer (n.)

"member of a criminal gang practicing extortion, 'protection,' intimidation, etc.," 1927, a word from Prohibition, from racket (n.1) in the "dishonest activity" sense + -eer. Earlier (1926) in reference to organizers of fraudulent bankruptcies. By 1928 as a verb. Related: Racketeering, verbal noun (1927).

[A] racketeer is nothing more nor less than a gangster who has organized thuggery along business lines. ["What is a Racketeer?" Brooklyn Daily Eagle, Oct. 7, 1928]