Solution

CLASS

3 clues

Category

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

Other solutions to Category

School group

Word class: Common noun
Nature of clue: Description
Difficulty: Very easy
Sources: Boatload Puzzles
Topics: Society

Seminar

Word class: Common noun
Nature of clue: Description
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Society

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