Solution

STACKS

2 clues

Heaps

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

Other solutions to Heaps

Piles

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

Other solutions to Piles

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