telephonist

Etymology tree
French télé-
Proto-Indo-European *bʰeh₂-der.
Proto-Hellenic *pʰōnā́
Ancient Greek φωνή (phōnḗ)der.
French -phone
French téléphonebor.
English telephone
Proto-Indo-European *-id-
Proto-Indo-European *-yéti
Proto-Indo-European *-idyéti
Proto-Hellenic *-íďďō
Ancient Greek -ῐ́ζω (-ĭ́zō)
Proto-Hellenic *-tās
Ancient Greek -τής (-tḗs)
Ancient Greek -ῐστής (-ĭstḗs)bor.
Latin -istader.
Old French -istebor.
Middle English -ist
English -ist
English telephonist
From telephone + -ist.