washing machine vs washer

washing machine and washer both are nouns.

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

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

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

Other synonyms of washing machine include automatic washer.

washing machine (noun)	washer (noun)
a home appliance for washing clothes and linens automatically	a home appliance for washing clothes and linens automatically
	seal consisting of a flat disk placed to prevent leakage
	someone who washes things for a living