sweeper vs employee

sweeper and employee both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweeper	Yes	No	No	No
employee	Yes	No	No	No

As nouns, employee is a hypernym of sweeper; that is, employee is a word with a broader meaning than sweeper:

sweeper (noun)	employee (noun)
little-known nocturnal fish of warm shallow seas with an oblong compressed body	a worker who is hired to perform a job
a cleaning implement with revolving brushes that pick up dirt as the implement is pushed over a carpet
an employee who sweeps (floors or streets etc.)