Skywriting rhymes with:
handwriting, screenwriting, scriptwriting, songwriting, typewriting, backbiting, bullfighting, expediting, extraditing, firefighting, gunfighting, handwriting, highlighting, infighting, moonlighting, screenwriting, scriptwriting, songwriting, spotlighting, typewriting
Skywriting sounds like:
sacredness, sardinas, sardines, sardonic, scrutinize, scrutinizes, scrutton's, secretions, sheraton's, shirting, shortening, shortens, shorting, shortness, shredding, shrewdness, shrouding, skirting, sorting, squirting