IPA: /ˈpræktɪsər/
KK: /ˈpræktɪsər/
A person who regularly engages in a particular activity or profession, especially in a skilled or professional manner.
As a dedicated practicer, she spends hours each day improving her musical skills.
Practicer → It is formed from "practice" (from Old French *practique*, meaning action or deed) and "-er" (meaning a person who). A practicer is a person who engages in a particular action or practice.
Think of someone who is actively engaged in doing something — 'practice' refers to the action, and '-er' indicates a person. This helps you remember that a practicer is someone who practices.