wage schedule vs wage scale

wage schedule and wage scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
wage schedule	Yes	No	No	No
wage scale	Yes	No	No	No

As nouns, wage schedule and wage scale are synonyms defined as:

wage schedule and wage scale: a schedule of wages paid for different jobs

wage schedule (noun)	wage scale (noun)
a schedule of wages paid for different jobs	a schedule of wages paid for different jobs