The term 'Boulevard Liner' refers to a type of luxury bus that is used for long-distance travel. The crossword solutions for this term are ELMS (4 letters), SWANSON (7 letters), NORMA (5 letters), and SUNSET (6 letters). Elms is likely referring to the Elms Luxury Coach, a popular model of boulevard liner. Swanson is likely referring to the Swanson Luxury Coach, another popular model of boulevard liner. NORMA is likely referring to the NORMA Luxury Coach, yet another popular model of boulevard liner. Finally, SUNSET is likely referring to the SUNSET Luxury Coach, the final popular model of boulevard liner.