living wage vs salary

living wage and salary both are nouns.

Word	Noun	Adjective	Verb	Adverb
living wage	Yes	No	No	No
salary	Yes	No	No	No

As nouns, salary is a hypernym of living wage; that is, salary is a word with a broader meaning than living wage:

living wage: a wage sufficient for a worker and family to subsist comfortably
salary: something that remunerates

Other hypernyms of living wage include earnings, pay, remuneration, wage.

living wage (noun)	salary (noun)
a wage sufficient for a worker and family to subsist comfortably	something that remunerates