riddance vs expulsion

riddance and expulsion both are nouns.

Word	Noun	Adjective	Verb	Adverb
riddance	Yes	No	No	No
expulsion	Yes	No	No	No

As nouns, riddance and expulsion are synonyms defined as:

Other synonyms of riddance include ejection, exclusion.

riddance (noun)	expulsion (noun)
the act of forcing out someone or something	the act of expelling or projecting or ejecting
the act of removing or getting rid of something	the act of forcing out someone or something
	squeezing out by applying pressure