noun
vocabulary power; extent of one's vocabulary
Refers to the size, depth, or command of one's vocabulary. Often used in educational contexts or self-assessment.
語彙力を増やすために毎日読書をしている。
I read every day to increase my vocabulary.
彼の語彙力はすごい。難しい言葉をたくさん知っている。
His vocabulary is amazing. He knows a lot of difficult words.
単語力 is similar but emphasizes knowledge of individual words (単語), whereas 語彙力 can include broader lexical competence.
Compound of 語彙 (vocabulary) and 力 (power, ability).