Solution

ELEMENTS

4 clues

Carbon and gold, e.g.

Word class: Common noun
Nature of clue: Example
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Maths Physics, Science

Components

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

Other solutions to Components

Hydrogen and oxygen, e.g.

Word class: Common noun
Nature of clue: Example
Difficulty: Easy
Sources: Boatload Puzzles
Topics: Maths Physics, Science

Wind and rain

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

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