surface gauge vs scribing block

surface gauge and scribing block both are nouns.

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

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

surface gauge 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 gauge include surface gage.

surface gauge (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