Solution

OMISSION

4 clues

Deletion

Word class: Common noun
Nature of clue: Synonym
Difficulty: Easy

Leaving out

Word class: Common noun
Nature of clue: Description
Difficulty: Easy

Other solutions to Leaving out

Oversight

Word class: Common noun
Nature of clue: Synonym
Difficulty: Easy

Other solutions to Oversight

Something left out

Word class: Common noun
Nature of clue: Description
Difficulty: Easy

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