ejection vs riddance

ejection and riddance both are nouns.

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

As nouns, ejection and riddance are synonyms defined as:

Other synonyms of ejection include exclusion, expulsion.

ejection (noun)	riddance (noun)
the act of forcing out someone or something	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