WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / R / rock wool rock wool noun /rɑkwʊl/ 9 letters Scrabble 17 WWF 19 Definitions noun a light fibrous material used as an insulator mineral wool Look “rock wool” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →