vernier scale vs vernier

vernier scale and vernier both are nouns.

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

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

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

vernier scale (noun)	vernier (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