A person who celebrates, honors, or commemorates something, especially one who leads or performs a ceremony.
From Latin 'celebrare' (to celebrate, perform, or honor) plus '-or,' a suffix indicating one who performs the action.
Celebrator is the modern standard form, preferred over 'celebrater'—it follows the same pattern as elevator (not elevater) and operator (not operater).
Complete word intelligence in one call. Free tier — 50 lookups/day.