The term 'strong paper' can be represented by two crossword solutions: MANILA (6 letters) and KRAFT (5 letters). MANILA paper is a type of paper made from the fibers of the abaca plant, which is native to the Philippines. It is known for its strength and durability, making it a popular choice for archival documents. Kraft paper is a type of paper made from wood pulp and is also known for its strength and durability. It is often used in packaging and wrapping materials.