The term 'smelling of mold' can be described as 'MUSTY', which is a five-letter word. MUSTY odors are often caused by the presence of mold, which is a type of fungus that grows in damp and humid environments. The smell of mold is usually described as MUSTY, earthy, or stale. It can also have a sweet or pungent odor. Mold can cause health problems if it is not removed from the environment, so it is important to identify and address any MUSTY smells as soon as possible.