also: マニヤ
Refers to a person who is deeply passionate about a specific hobby, interest, or collecting area. Often used in compounds like 鉄道マニア (railway enthusiast) or 映画マニア (movie buff).
He is a stamp enthusiast and collects stamps from all over the world.
That shop has many rare items for enthusiasts.
Describes a state of intense excitement or obsession about something, often a trend or fad. Can be used as a standalone noun or in phrases like マニアになる (to become obsessed).
Recently, Showa retro has become a craze among enthusiasts.
I'm amazed at her enthusiasm for cooking.
He's a huge railway enthusiast and goes out to take photos every holiday.
I've recently become obsessed with anime.
This shop deals in expensive models aimed at enthusiasts.
マニア is a neutral loanword usable as a standalone noun or suffix, while 狂 is a more colloquial, intense suffix implying near-obsessive devotion.
専 is an internet-slang suffix meaning someone is exclusively obsessed with or fetishizes a thing, while マニア is the more general word for an enthusiast or fanatic and can stand alone as a noun.
マニア describes an enthusiast with intense knowledge or devotion to a hobby, whereas ジャンキー (sense 2) casts the same devotion as a compulsive 'addiction'.
マニア is a neutral loanword for an enthusiast, while 狂い (as the suffix ~狂い) implies an obsessive, almost crazed level of devotion.
マニア just means an enthusiast or fanatic about something, whereas ヲタ carries the specific cultural connotation of anime/idol/train-style otaku subcultures.
マニア labels someone as an enthusiast passionate about a specific subject, while 凝り性 describes the underlying trait of getting intensely absorbed in whatever one takes up.
マニア is a fairly neutral word for a dedicated enthusiast, while 厨 always carries a mocking, insulting tone.