stillbirth vs miscarriage

stillbirth and miscarriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
stillbirth	Yes	No	No	No
miscarriage	Yes	No	No	No

As nouns, stillbirth and miscarriage are synonyms defined as:

stillbirth and miscarriage: a natural loss of the products of conception

Other synonyms of stillbirth include spontaneous abortion.

stillbirth (noun)	miscarriage (noun)
a natural loss of the products of conception	a natural loss of the products of conception
	failure of a plan