domine vs dominus

domine and dominus both are nouns.

Word	Noun	Adjective	Verb	Adverb
domine	Yes	No	No	No
dominus	Yes	No	No	No

As nouns, domine and dominus are synonyms defined as:

domine and dominus: a clergyman; especially a settled minister or parson

Other synonyms of domine include dominee, dominie.

domine (noun)	dominus (noun)
a clergyman; especially a settled minister or parson	a clergyman; especially a settled minister or parson