undertaking vs baby

undertaking and baby both are nouns.

Word	Noun	Adjective	Verb	Adverb
undertaking	Yes	No	No	No
baby	Yes	No	Yes	No

As nouns, baby is a hyponym of undertaking; that is, baby is a word with a more specific, narrower meaning than undertaking:

undertaking (noun)	baby (noun)
any piece of work that is undertaken or attempted	a project of personal concern to someone
the trade of a funeral director	a very young mammal
	a very young child (birth to 1 year) who has not yet begun to walk or talk
	the youngest member of a group (not necessarily young)
	an immature childish person
	an unborn child; a human fetus
	a beloved person; used as terms of endearment

undertaking (verb)	baby (verb)
	treat with excessive indulgence