pink slip vs dismission

pink slip and dismission both are nouns.

Word	Noun	Adjective	Verb	Adverb
pink slip	Yes	No	No	No
dismission	Yes	No	No	No

As nouns, pink slip and dismission are synonyms defined as:

pink slip and dismission: official notice that you have been fired from your job

Other synonyms of pink slip include dismissal.

pink slip (noun)	dismission (noun)
official notice that you have been fired from your job	the termination of someone's employment (leaving them free to depart)
	official notice that you have been fired from your job