Solution

ENTAIL

4 clues

Include

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

Other solutions to Include

Involve

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

Other solutions to Involve

Necessitate

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

Require

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

Other solutions to Require

NEED

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