Solution

BOX

2 clues

Carton

Word class: Common noun
Nature of clue: Synonym
Difficulty: Medium
Sources: Boatload Puzzles

Crate

Word class: Common noun
Nature of clue: Synonym
Difficulty: Medium
Sources: Boatload Puzzles

Other solutions to Crate

CASE

Words are categorized by artificial intelligence: there can be mistakes.