vernier vs vernier scale

vernier and vernier scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
vernier	Yes	No	No	No
vernier scale	Yes	No	No	No

As nouns, vernier and vernier scale are synonyms defined as:

vernier and vernier scale: a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale

vernier (noun)	vernier scale (noun)
a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale	a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale