beginning vs birth

beginning and birth both are nouns.

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

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

Other hyponyms of beginning include incipience, incipiency, starting point, terminus a quo, threshold.

beginning (noun)	birth (noun)
the act of starting something	the event of being born
the first part or section of something	a baby born; an offspring
the event consisting of the start of something	the process of giving birth
the place where something begins, where it springs into being	the kinship relation of an offspring to the parents
the time at which something is supposed to begin	the time when something begins (especially life)

beginning (adjective)	birth (adjective)
serving to begin

beginning (verb)	birth (verb)
	cause to be born