IPA: /ˈfænsiər/
KK: /ˈfænsiər/
A person who has a strong interest in or enthusiasm for a particular subject, often related to breeding animals or growing plants for specific qualities.
She is a fancier of rare orchids and spends a lot of time caring for her collection.
Fancier → It is formed from "fancy" (from Middle English *fancy*, meaning imagination or a liking) and "-er" (meaning a person who). A fancier is a person who has a liking or strong interest in something, often in a specific hobby or collection.
Think of someone who has a strong 'liking' ('fancy') for something — that's what a fancier is, a person who enjoys or is passionate about a particular interest.