Box
counter, noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well.
The reading is the same as the one you learned with the kanji.
コウイチは、大切にしていたダンボール箱がすてられたことを知って、顔面そう白になりました。
Koichi turned pale when he learned that his precious cardboard box had been thrown away.
夫がトマトを箱で買ってきて、食べきれなくてこまっています。
My husband bought tomatoes by the crate and we're having trouble eating them all.
トーフグのオフィスに届いた箱の中には、辞書と死んだフグが詰まっていた。
The box that arrived at the Tofugu office was crammed with dictionaries and dead puffer fish.