The term 'FERN's Leaf' is a synonym for the word 'FROND, ' which is a five-letter word. A FROND is a type of leaf that is typically found on ferns, and is characterized by its large size and divided structure. Fronds are usually composed of multiple leaflets, which are arranged in a fan-like pattern. Ferns are a type of plant that reproduce through spores, and are found in a variety of habitats, including moist forests and tropical regions.