頻出

1. Origins, structure, and basic meaning

• Structure: In 頻出 (ひんしゅつ), frequent 頻 and emerge 出 combine to denote frequent occurrence.
• Basic usage: 頻出 means that a word, question, or phenomenon appears often.

2. Common pitfalls and similar expressions

• Frequency versus importance
  • 頻出語 is a frequently occurring word and 頻出する expresses repeated occurrence, but neither says it is important or difficult.