The term 'packed tightly' can be described by three crossword solutions: CROWD (5 letters), tamped (6 letters), and DENSE (5 letters). A CROWD is a large group of people gathered together in one place. Tamped is an action verb meaning to press down firmly, usually with a tool. DENSE is an adjective that describes something that is closely packed together. All three words describe the term 'packed tightly' as they all refer to things that are closely grouped together.