What is the meaning of Doer?

Someone who does, performs, or executes; an active person, an agent.

way over there; far away

to ache, hurt; to cause pain

to take pity

doer, agent (someone who does, performs, or executes)

offender (criminal who commits a specified crime)

cause, reason

indefinite plural of do

to hurt (be painful)

to hurt; to pain (cause emotional pain)

present subjunctive/imperative impersonal literary of dod

Source: wiktionary.org