マニアmania

1. nounenthusiast
   あいつはカーマニアだから、車くるまのことならなんでも知しってるよ。↗

   He's a car nut. Ask him anything.
2. nounmania; enthusiasm

• SynonymファンNeutralLoanword for a fan or devotee; stresses liking and supporting a person or work. 「マニア」 suggests absorption taken to expert depth.
• Synonym愛好家あいこうかNeutralA dignified word for an enthusiast, as in 「音楽愛好家」; lacks the obsessive feel of 「マニア」, which stresses deep absorption.
• Synonym愛好者あいこうしゃNeutralClose to 「愛好家」; often seen in statistics and explanatory writing. 「マニア」 carries a nuance of obsession and expertise.
• Synonym凝り屋こりやCasualColloquial for someone who studies a subject intently and is particular about details, with a perfectionist tinge; 「マニア」 stresses enthusiasm for a field.
• RelatedキチガイCasualLiterally a madman; as 「…キチガイ」 it means an enthusiast but is discriminatory and best avoided. Use neutral 「マニア」 instead.

Use 「マニア」 for a devotee absorbed in a field, as in 「鉄道マニア」. Pick 「ファン」 for liking or supporting someone, 「愛好家」 for formal contexts, 「凝り屋」 for a detail-obsessed perfectionist; avoid 「気違い」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 何なんかある事物じぶつに熱中ねっちゅうすること。また、そのような人ひと。