hortatorn.

/hɔːˈteɪtə/Etymology: < Latin hortātor, agent-noun < hortārī to exhort.
the mind > will > motivation > [noun] > incitement or instigation > exhortation > one who
1880 L. Wallace 140 With an angry crash, down fell the gravel of the hortator.
This entry has not yet been fully updated (first published 1899; most recently modified version published online March 2018).