As proper nouns the difference between haley and greek
is that
haley is {{surname|from=Old English}}, a common spelling variant of Hayley while
Greek is the language of the Greek people, spoken in Greece and in Greek communities.
As a noun Greek is
an inhabitant, resident, or a person of descent from Greece.
As an adjective Greek is
of or relating to Greece, the Greek people, or the Greek language.
As a verb greek is
to display a placeholder instead of text, especially to optimize speed in displaying text that would be too small to read.