A key enthusiast is one way to identify them. There is no actual term to refer to someone who collects keys out of enjoyment, but if they keep the keys out of fear that they may find a use for them after throwing them away, they are potentially a compulsive hoarder.
someone who collects umbrellas
A paper collector
A badge collector.
A locksmith. Home depot can make copies of keys.
Someone who collects collective nouns is known as a "collective noun enthusiast" or a "collective noun collector." These individuals have a keen interest in linguistics and the unique ways in which language categorizes groups of objects or beings. Their hobby involves researching, compiling, and possibly even creating new collective nouns for various groups.
Someone who collects keys is often referred to as a "key collector." This hobby can include collecting various types of keys, such as antique, decorative, or functional keys. Additionally, the term "key enthusiast" may also be used to describe individuals who have a passion for keys and their history.
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A catapultist.
I would call him a hobbyist.
A button collector??
dumb
normally .you call one .a letterologist.
You would call them a locksmith. Locksmiths make keys for everyday use.
a hoarder x)
Graphologist comes to mind or autograph hunter.
Someone with too much time on their hands and too much space?
A key maker. -.-