scribing block vs surface gage

scribing block and surface gage both are nouns.

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

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

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

Other synonyms of scribing block include surface gauge.

scribing block (noun)	surface gage (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