acrosome vs outgrowth

acrosome and outgrowth both are nouns.

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

As nouns, outgrowth is a hypernym of acrosome; that is, outgrowth is a word with a broader meaning than acrosome:

acrosome: a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of acrosome include appendage, process.

acrosome (noun)	outgrowth (noun)
a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg	a natural prolongation or projection from a part of an organism either animal or plant
	the gradual beginning or coming forth
	a natural consequence of development