What is another name for a vacuum?

What is another name for a vacuum depends on context, as vacuum has different meanings in science and household appliance. For household vacuum cleaner, common alternative names include vacuum cleaner, vac, sweeper, carpet sweeper, suction cleaner, hoover, and electric broom. In the UK, hoover is widely used as generic term for vacuum cleaner, even though Hoover is a brand name, similar to saying Kleenex for tissues, people say do the hoovering meaning vacuuming. In the US, vac is informal short form, and upright or canister describes type. For industrial versions, other names include dust extractor, dust collector, Shop-Vac for wet dry type, Dustbuster for handheld, and robovac or robot vac for autonomous. In scientific context, another name for vacuum as empty space is void, empty space, vacuity, or free space. Physicists may refer to vacuum as vacuum state or empty space. In packaging, vacuum may be called vacuum sealed. So alternative name varies: for appliance, hoover, sweeper, and vac are most common, while for physics concept, void or empty space are synonyms, but vacuum cleaner is standard technical name.