A person or thing that applies something, such as someone who puts an application on a surface or submits an application.
From 'apply' plus the agent suffix '-er,' meaning 'one who applies.' This word has been used in English since the 1500s to describe a person who applies effort or materials.
An applier could be someone plastering a wall, a person submitting a job application, or even a computer program that applies updates—the word is flexible enough to cover anyone or anything doing the action of applying.
Complete word intelligence in one call. Free tier — 50 lookups/day.