number of words; word count
Refers to the quantity of words used, often in the context of being talkative or concise.
He is a man of few words.
言葉数が多い説明だった。
It was a wordy explanation.
vocality; talkativeness
Emphasizes the degree of verbal expression or loquacity, often used in set phrases like 言葉数が少ない/多い.
She is very talkative and always lively.
Compound of 言葉 (word, language) and 数 (number). The reading ことばかず uses rendaku voicing on 数.