lock washer vs lock ring

lock washer and lock ring both are nouns.

Word	Noun	Adjective	Verb	Adverb
lock washer	Yes	No	No	No
lock ring	Yes	No	No	No

As nouns, lock washer and lock ring are synonyms defined as:

Other synonyms of lock washer include lockring.

lock washer (noun)	lock ring (noun)
washer that prevents a nut from loosening	washer that prevents a nut from loosening