Aerospace's rhymes with:
airspaces, cyberspace's, airspaces, cyberspace's, outpaces, airspaces, birthplaces, bookcases, briefcases, cyberspace's, databases, interfaces, marketplace's, marketplaces, outpaces, showcases, staircases, suitcases, workplaces
Aerospace's sounds like:
aerospace, airships, airspace, airspaces, archibeque, archives