give birth vs birth

give birth is not a noun while birth is a noun.

Word	Noun	Adjective	Verb	Adverb
give birth	No	No	Yes	No
birth	Yes	No	Yes	No

As verbs, give birth and birth are synonyms defined as:

Other synonyms of give birth include bear, deliver, have.

give birth (noun)	birth (noun)
	the event of being born
	a baby born; an offspring
	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

give birth (verb)	birth (verb)
cause to be born	cause to be born
create or produce an idea