effacement vs self-effacement

effacement and self-effacement both are nouns.

Word	Noun	Adjective	Verb	Adverb
effacement	Yes	No	No	No
self-effacement	Yes	No	No	No

As nouns, effacement and self-effacement are synonyms defined as:

effacement and self-effacement: withdrawing into the background; making yourself inconspicuous

effacement (noun)	self-effacement (noun)
withdrawing into the background; making yourself inconspicuous	withdrawing into the background; making yourself inconspicuous
shortening of the uterine cervix and thinning of its walls as it is dilated during labor