dish washer vs dishwasher

dish washer and dishwasher both are nouns.

Word	Noun	Adjective	Verb	Adverb
dish washer	Yes	No	No	No
dishwasher	Yes	No	No	No

As nouns, dish washer and dishwasher are synonyms defined as:

Other synonyms of dish washer include dishwashing machine.

dish washer (noun)	dishwasher (noun)
a machine for washing dishes	a machine for washing dishes
	someone who washes dishes