concordancer

Etymology tree
Proto-Indo-European *ḱe?
Proto-Indo-European *ḱóm
Proto-Italic *kom
Old Latin com
Late Latin cum
Proto-Indo-European *ḱerd-
Proto-Indo-European *ḱḗr
Proto-Indo-European *ḱr̥d-
Proto-Italic *kord
Late Latin cor
Late Latin concors
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-yéti
Proto-Indo-European *-eh₂yéti
Proto-Italic *-āō
Late Latin -ō
Late Latin concordō
Late Latin concordantiader.
Old French concordanceder.
English concordance
Proto-Indo-European *-yósder.
Proto-Italic *-āzijos
Latin -āriusnom.
Latin -āriusbor.
Proto-Germanic *-ārijaz
Proto-West Germanic *-ārī
Old English -ere
Middle English -ere
English -er
English concordancer
From concordance + -er.