کم

In a sentence

• من فقط کمی آب می‌خواهم.

  I only want a little water.

  In this sentence, "کم" is used to denote a small quantity of something, in this case, water.

• دیدم که دنبال کتاب هستی، بگذار کمک کنم.

  I saw you were looking for a book, let me help.

  Here, the root "کم" is part of the word "کمک" which means 'help', showing its derivation in compound forms.

• لباس‌های کمتری بیاور و سبک سفر کن.

  Bring fewer clothes and travel light.

  In this sentence, "کمتر" (a comparative form derived from "کم") is used to suggest bringing a smaller quantity compared to usual.