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.
He's a stamp-collecting fanatic, and his room is full of stamps.
That person is known as an antique-collecting maniac.
コレクター is a neutral loanword for 'collector', while 収集狂 implies an obsessive or fanatical level of collecting.
マニア is a broader term for 'enthusiast' or 'mania', often used for hobbies; 収集狂 specifically focuses on the act of collecting.
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.