言葉数 (kotobakazu: number of words; level of talkativeness)
word + number
This sample sentence comes from Jim Breen’s online dictionary:
彼は言葉数が少ない。
Kare wa kotobakazu ga sukunai.
He is brief of speech.Here’s a related expression:
言葉に詰まる (kotoba ni tsumaru: to be at a loss for words) word + to be shortened, to contract