Mold growth is a type of fungus that can grow on various surfaces. It is often caused by the presence of spores, which are microscopic reproductive cells that can be spread through the air. The crossword solution for the term 'mold growth' is 'SPORE, ' which is a five-letter word. Spores are the primary cause of mold growth and can be found in many different environments. They are typically spread through the air and can cause health problems if inhaled.