war baby vs baby

war baby and baby both are nouns.

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

As nouns, baby is a hypernym of war baby; that is, baby is a word with a broader meaning than war baby:

war baby: conceived or born during war
baby: a very young child (birth to 1 year) who has not yet begun to walk or talk

Other hypernyms of war baby include babe, infant.

war baby (noun)	baby (noun)
conceived or born during war	a project of personal concern to someone
	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

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