Leaf COLLECTION is a task that involves gathering fallen leaves from the ground. The crossword solutions for the term LEAF COLLECTION are BOOK (4 letters), QUIRE (5 letters), and PILE (4 letters). BOOK refers to a COLLECTION of written sheets of paper bound together, QUIRE is a set of 24 or 25 sheets of paper, and PILE is a large number of objects placed on top of each other. Therefore, LEAF COLLECTION can be thought of as gathering fallen leaves into books, quires, or piles.