Someone who collects venom is often referred to as a "venom collector" or "venom researcher." These individuals may work in scientific research, antivenom production, or educational purposes, focusing on the study and utilization of venom from various species, such as snakes, Spiders, and other venomous animals. Their work can contribute to advancements in medicine and toxinology.
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A catapultist.
I would call him a hobbyist.
A button collector??
dumb
normally .you call one .a letterologist.
a hoarder x)
Graphologist comes to mind or autograph hunter.
Someone with too much time on their hands and too much space?
An aquarist is someone who collects fish in aquariums. They can also simply be called fish keepers. Some collect a variety of fish, while others specialize in a few kinds.
An Arctophile.
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.