collection

1. Origins, structure, and basic meaning

• Structure: 彙 has 13 strokes and the on-reading い. Its sense of a collection appears in 語彙 (ごい), vocabulary as a collection of words.
• Basic usage: 語彙 refers to vocabulary or words suited to a passage; 語彙力 (ごいりょく) concerns the ability to know and use words.

2. Common pitfalls and similar expressions

• Vocabulary and word knowledge
  • 使える語彙が少しずつ増えた means that usable vocabulary gradually increased. 文章に合う語彙 refers to words appropriate for a passage.
  • 語彙力が少しずつ伸びます means that word knowledge gradually improves. 語彙力の不足 refers to limitations in vocabulary ability noticed while writing.