How to say "fad" in Japanese

• ブームJLPT N1approx.Common
  noun, noun (suffix)Covers 'fad' as a craze: a wave of enthusiastic, widespread interest in something, typically intense but short-lived. Suits talk of a sudden surge of popularity, something being all the rage.
  小型車こがたしゃのブームは終おわろうとしている。↗

  The small car boom is ending.
• 流行りゅうこうJLPT N3approx.Common
  suru verb, intransitive verb, no-adjectiveMainly 'fashion, trend, vogue': what is currently in style or prevailing. For 'fad' it works when the idea shades toward a passing trend or craze, though ブーム is the closer match for a sudden craze.
  あの種しゅの服ふくが今いま流行りゅうこうだ。↗

  That kind of dress is now in fashion.

Use 「ブーム」 for a fad in the sense of a sudden, often short-lived craze that sweeps up public attention, and 流行 when the emphasis falls on what is currently in vogue or fashionable, the trend side of 'fad'.

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

• ブームboom
• 流行りゅうこうfashion
• 流行りはやりfashion
• ファッドfad
• 時好じこうfad