As verbs the difference between greet and grees
is that
greet is to address with salutations or expressions of kind wishes; to salute; to hail; to welcome; to accost with friendship; to pay respects or compliments to, either personally or through the intervention of another, or by writing or token or
greet can be (scotland|northern england) to weep; to cry while
grees is .
As an adjective greet
is (obsolete|outside|scotland) great.
As a noun greet
is mourning, weeping, lamentation.