alveolar process vs alveolus

alveolar process and alveolus both are nouns.

Word	Noun	Adjective	Verb	Adverb
alveolar process	Yes	No	No	No
alveolus	Yes	No	No	No

alveolar process (noun)	alveolus (noun)
a ridge that forms the borders of the upper and lower jaws and contains the sockets of the teeth	a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
	a bony socket in the alveolar ridge that holds a tooth