Etymology
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Words related to -ologist

-ology 

word-forming element indicating "branch of knowledge, science," now the usual form of -logy. Originally used c. 1800 in nonce formations (commonsensology, etc.), it gained legitimacy by influence of the proper formation in geology, mythology, etc., where the -o- is a stem vowel in the previous element.

The second element is prop[erly] -logy (-logue, etc.), the -o- belonging to the preceding element; but the accent makes the apparent element in E[nglish] to be -ology, which is hence often used as an independent word. [Century Dictionary] 
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-ist 
word-forming element meaning "one who does or makes," also used to indicate adherence to a certain doctrine or custom, from French -iste and directly from Latin -ista (source also of Spanish, Portuguese, Italian -ista), from Greek agent-noun ending -istes, which is from -is-, ending of the stem of verbs in -izein, + agential suffix -tes.

Variant -ister (as in chorister, barrister) is from Old French -istre, on false analogy of ministre. Variant -ista is from Spanish, popularized in American English 1970s by names of Latin-American revolutionary movements.
escapologist (n.)
performer who specializes in getting out of confinement, 1926; see escape + -ologist. Related: Escapology.
mixologist (n.)

"bartender," 1856, a U.S. jocular slang formation from mix (v.) + ending from the sciences (see -ologist). The full term in the earliest reference is mixologist of tipicular fixins.

pyrgologist (n.)

"one versed in the structure and history of towers," 1877, from Greek pyrgos "a tower, wall-tower, siege-tower; highest point of a building" (a technical term in architecture, of uncertain origin, according to Beekes "clearly Pre-Greek") + -ologist. It seems to have been used once, in The Athenaeum of Aug. 18, 1877, and then forgotten except in dictionaries.