The term 'Broadway Brightener' is a combination of five words, each with a different number of letters. The first word is 'NEON', which is a type of gas used in lighting and signage. The second word is 'PORTHOLE', which is a small window on a ship or submarine. The third word is 'LAMP', which is a device that produces light. The fourth word is 'ION', which is an atom or molecule with a net electric charge. The fifth word is 'TINSEL', which is a type of decorative material made of thin strips of metal foil. Finally, the sixth word is 'Tetra', which is a four-sided figure. Together, these words form the term 'Broadway Brightener', which is a phrase used to describe the bright lights of Broadway.