automatic washer vs washing machine

automatic washer and washing machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
automatic washer	Yes	No	No	No
washing machine	Yes	No	No	No

As nouns, automatic washer and washing machine are synonyms defined as:

automatic washer and washing machine: a home appliance for washing clothes and linens automatically

Other synonyms of automatic washer include washer.

automatic washer (noun)	washing machine (noun)
a home appliance for washing clothes and linens automatically	a home appliance for washing clothes and linens automatically