fanatic collector; collecting maniac
Describes a person obsessed with collecting things, often to an excessive degree. The suffix 狂 (きょう) adds a nuance of mania or madness.
彼は切手の収集狂で、部屋中が切手だらけだ。
He's a stamp-collecting fanatic, and his room is full of stamps.
あの人は骨董品の収集狂として知られている。
That person is known as an antique-collecting maniac.
Standard kanji spelling using the common 収集 (collection).
Variant using the less common 蒐集 (collection); 蒐 is a non-jōyō kanji.
Compound of 収集 (collection) and 狂 (mania, madness). The suffix 狂 is used to indicate an extreme obsession with the preceding noun.