• 句読点くとうてん — punctuation marks
• 俳句はいく — haiku poem
• 文句もんく — phrase / complaint
• 語句ごく — words and phrases
• 警句けいく — epigram / maxim
• 短句たんく — short phrase

句 is composed of the radical 口 (mouth) and the component 勹. It originally conveyed the idea of something enclosed or turned, and came to represent a unit of speech or writing — a phrase or clause.

彼かれは 俳句はいくを 毎日まいにち 作つくっています。
He writes haiku poems every day.

文ぶんには 句読点くとうてんを 正確せいかくに 使つかいましょう。
Let’s use punctuation marks properly in writing.