street sweeper vs street cleaner

street sweeper and street cleaner both are nouns.

Word	Noun	Adjective	Verb	Adverb
street sweeper	Yes	No	No	No
street cleaner	Yes	No	No	No

As nouns, street sweeper and street cleaner are synonyms defined as:

street sweeper and street cleaner: a worker employed to clean streets (especially one employed by a municipal sanitation department)

street sweeper (noun)	street cleaner (noun)
a worker employed to clean streets (especially one employed by a municipal sanitation department)	a worker employed to clean streets (especially one employed by a municipal sanitation department)