gum ridge vs outgrowth

gum ridge and outgrowth both are nouns.

Word	Noun	Adjective	Verb	Adverb
gum ridge	Yes	No	No	No
outgrowth	Yes	No	No	No

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

gum ridge: a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of gum ridge include appendage, process.

gum ridge (noun)	outgrowth (noun)
a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth	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