The term 'strong attachment' can be described by two crossword solutions: EPOXY (5 letters) and BOND (4 letters). EPOXY is a type of adhesive that is made up of a resin and a hardener, which when mixed together form a strong BOND. BOND is a term used to describe the connection between two objects or people, usually referring to a strong connection. Both EPOXY and BOND are used to describe a strong attachment between two objects or people.