G1482–ἐθνικός–ethnikos

And if you salute only your near relatives, what praise is due to you? Do not even the Gentiles do the same?

ἐθνικοὶ ethnikoi “Gentiles”

"And when praying, do not use needless repetitions as the Gentiles do, for they expect to be listened to because of their multitude of words.

ἐθνικοί· ethnikoi “pagans;”

If he refuses to hear them, appeal to the Church; and if he refuses to hear even the Church, regard him just as you regard a Gentile or a tax-gatherer.

ἐθνικὸς ethnikos “pagan”

For it is for Christ that they have gone forth, accepting nothing from the Gentiles.

ἐθνικῶν. ethnikōn “Gentile [people].”