Vacuum
Part of speech: noun
Definition: A region of space that contains no matter. A vacuum cleaner.
Part of speech: verb
Definition: To clean (something) with a vacuum cleaner. To use a vacuum cleaner.
Example sentence: There is hopeful symbolism in the fact that flags do not wave in a vacuum.
Vacancy
Part of speech: noun
Definition: An unoccupied position or job.An available room in a hotel; guest house, etc.Empty space.Lack of intelligence or understanding.The absence of program.
Example sentence: I began to get calls from constituents, 'Do you think you can ever get on transportation?' So when there was a vacancy created, I worked very hard to get there.