ダンボール (danbōru) means “cardboard box”

More examples

使い終わったダンボールは資源ごみに出します。tsuka i o wa tta da n bō ru wa shi gen go mi ni da shi ma su

I put used cardboard boxes out for recycling.

It refers to corrugated paperboard as a material and to a box made from it, combining lightness with enough firmness to protect what it holds.

箱hako: A general container with a base and sides for enclosing items.

波形に加工した紙を平らな紙で挟んだ厚紙、またはそれで作った箱。ha kei ni ka kō shi ta kami o tai ra na kami de hasa n da atsu gami ma ta wa so re de tsuku tta bako

ダンボール (danbōru) is based on 段ボール (danbōru): 段 (dan, "step") describes the ridged layers, and ボール (bōru) is a Japanese form of English board.

In everyday English, cardboard usually names the material, while cardboard box names the container, so cardboard alone does not always mean a box.