Sticky matter is a term used to describe substances that are thick, viscous, and often difficult to remove. The crossword solutions for this term are GUNK (4 letters), GOO (3 letters), GOOP (4 letters), and HOTPOTATO (9 letters). GUNK is a slang term for a sticky, slimy substance, while GOO is a more general term for a sticky, viscous liquid. GOOP is a term used to describe a thick, slimy substance, and HOTPOTATO is a term used to describe a situation that is difficult to handle or resolve.