surface gage vs scribing block

surface gage and scribing block both are nouns.

Word	Noun	Adjective	Verb	Adverb
surface gage	Yes	No	No	No
scribing block	Yes	No	No	No

As nouns, surface gage and scribing block are synonyms defined as:

surface gage and scribing block: gauge consisting of a scriber mounted on an adjustable stand; used to test the accuracy of plane surfaces

Other synonyms of surface gage include surface gauge.

surface gage (noun)	scribing block (noun)
gauge consisting of a scriber mounted on an adjustable stand; used to test the accuracy of plane surfaces	gauge consisting of a scriber mounted on an adjustable stand; used to test the accuracy of plane surfaces