incubation vs birthing

incubation and birthing both are nouns.

Word	Noun	Adjective	Verb	Adverb
incubation	Yes	No	No	No
birthing	Yes	No	No	No

As nouns, birthing is a hypernym of incubation; that is, birthing is a word with a broader meaning than incubation:

Other hypernyms of incubation include birth, giving birth, parturition.

incubation (noun)	birthing (noun)
maintaining something at the most favorable temperature for its development	the process of giving birth
sitting on eggs so as to hatch them by the warmth of the body
(pathology) the phase in the development of an infection between the time a pathogen enters the body and the time the first symptoms appear