odontoid process vs outgrowth

odontoid process and outgrowth both are nouns.

Word	Noun	Adjective	Verb	Adverb
odontoid process	Yes	No	No	No
outgrowth	Yes	No	No	No

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

odontoid process: a toothlike process at the back of 2nd vertebra of the neck
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of odontoid process include appendage, process.

odontoid process (noun)	outgrowth (noun)
a toothlike process at the back of 2nd vertebra of the neck	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