pay packet vs salary

pay packet and salary both are nouns.

Word	Noun	Adjective	Verb	Adverb
pay packet	Yes	No	No	No
salary	Yes	No	No	No

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

pay packet: wages enclosed in an envelope for distribution to the wage earner
salary: something that remunerates

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

pay packet (noun)	salary (noun)
wages enclosed in an envelope for distribution to the wage earner	something that remunerates