get-go vs birth

get-go and birth both are nouns.

Word	Noun	Adjective	Verb	Adverb
get-go	Yes	No	No	No
birth	Yes	No	Yes	No

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

Other hyponyms of get-go include incipience, incipiency, starting point, terminus a quo, threshold.

get-go (noun)	birth (noun)
the time at which something is supposed to begin	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)

get-go (verb)	birth (verb)
	cause to be born