white metal vs bearing metal

white metal and bearing metal both are nouns.

Word	Noun	Adjective	Verb	Adverb
white metal	Yes	No	No	No
bearing metal	Yes	No	No	No

As nouns, white metal and bearing metal are synonyms defined as:

white metal and bearing metal: an alloy (often of lead or tin base) used for bearings

white metal (noun)	bearing metal (noun)
an alloy (often of lead or tin base) used for bearings	an alloy (often of lead or tin base) used for bearings