Synonyms for Vacuum (same or very similar meaning)
WordNet sense 1 (the absence of matter):
vacuityWordNet sense 2 (an empty area or space):
emptiness, vacancy, voidWordNet sense 3 (an electrical home appliance that cleans by suction):
vacuum cleanerWordNet sense 4 (clean with a vacuum cleaner):
hoover, vacuum-cleanFrom the ODE community, based on WordNetadd/edit