Gross growth is a term used to describe the increase in size of something, usually referring to an increase in population or economic output. In this crossword, the solutions for gross growth are 'mold' and 'WART'. Mold is a type of fungus that grows on organic matter, while warts are small, benign skin growths caused by a virus. Both mold and warts can grow quickly and spread rapidly, making them good examples of gross growth.