beginning vs outgrowth

beginning and outgrowth both are nouns.

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

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

beginning (noun)	outgrowth (noun)
the act of starting something	a natural prolongation or projection from a part of an organism either animal or plant
the first part or section of something	the gradual beginning or coming forth
the event consisting of the start of something	a natural consequence of development
the place where something begins, where it springs into being
the time at which something is supposed to begin

beginning (adjective)	outgrowth (adjective)
serving to begin