G1482–ἐθνικός–ethnikos

If you only greet your friends, what more do you do than others? Don't even the tax collectors do the same?

ἐθνικοὶ ethnikoi “Gentiles”

In praying, don't use vain repetitions, as the Gentiles do; for they think that they will be heard for their much speaking.

ἐθνικοί· ethnikoi “pagans;”

If he refuses to listen to them, tell it to the assembly. If he refuses to hear the assembly also, let him be to you as a Gentile or a tax collector.

ἐθνικὸς ethnikos “pagan”

because for the sake of the Name they went out, taking nothing from the Gentiles.

ἐθνικῶν. ethnikōn “Gentile [people].”