There are a total of 56 8-letter words containing 'box', and the number may vary in different dictionaries. You can specify the dictionary and order.

• blackbox ₂₉
• boxberry ₂₃
• boxboard ₂₂
• boxelder ₂₀
• boxhauls ₂₂
• boxiness ₁₉
• boxplots ₂₂
• boxrooms ₂₁
• boxscore ₂₁
• boxthorn ₂₁
• boxwoods ₂₂
• brainbox ₂₂
• breadbox ₂₂
• carboxyl ₂₄
• checkbox ₃₀
• combobox ₂₇
• econobox ₂₂
• glovebox ₂₅
• grassbox ₂₀
• hatboxes ₂₀
• hayboxes ₂₂
• homeobox ₂₃
• horsebox ₂₀
• hotboxes ₂₀
• iceboxes ₂₁
• inboxing ₂₂
• jewelbox ₃₁
• lightbox ₂₃
• lunchbox ₂₆
• matchbox ₂₆
• moneybox ₂₄
• outboxed ₂₀
• outboxes ₁₉
• paintbox ₂₂
• pegboxes ₂₃
• pressbox ₂₁
• redboxes ₁₉
• saucebox ₂₂
• scorebox ₂₁
• skyboxes ₂₄
• smokebox ₂₅
• sneakbox ₂₃
• snuffbox ₂₆
• soundbox ₂₁
• suboxide ₂₀
• sweatbox ₂₁
• teaboxes ₁₈
• unboxing ₂₃
• voicebox ₂₅
• boxballs ₁₉
• clackbox ₂₅
• clangbox ₂₀
• emboxing ₂₀
• jawboxes ₂₇
• loosebox ₁₇
• watchbox ₂₅

There are 56 8-letter words containing box in the well-known word game dictionary, 33 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 38 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 49 in the Words with Friends (WWF) dictionary.