Solution

OVERRIDES

3 clues

Countermands

Word class: Verb
Nature of clue: Synonym
Difficulty: Hard
Sources: Boatload Puzzles
Topics: Law

Nullifies

Word class: Verb
Nature of clue: Synonym
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Law

Other solutions to Nullifies

Supersedes

Word class: Verb
Nature of clue: Synonym
Difficulty: Medium
Sources: Boatload Puzzles
Topics: Law

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