The crossword solution for the term 'Neighbor of Cygnus' is LYRA, which is a four-letter word. LYRA is a constellation located in the northern sky, and it is bordered by the constellations Draco, Hercules, Vulpecula, and Cygnus. It is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it is also one of the 88 modern constellations recognized by the International Astronomical Union. LYRA is best known for containing the star Vega, which is the fifth brightest star in the night sky.