The second time the word church is mentioned is... Now of course this wasn't originally English, it was the word...
ἐκκλησία
ekklēsia
ek-klay-see'-ah
From a compound of G1537 and a derivative of G2564; a calling out, that is, (concretely) a popular meeting, especially a religious congregation (Jewish synagogue, or Christian community of members on earth or saints in heaven or both): - assembly, church.
Matt 18:15;
"If your brother sins, go and show him his fault in private; if he listens to you, you have won your brother.
Matt 18:16; "But if he does not listen to you, take one or two more with you, so that BY THE MOUTH OF TWO OR THREE WITNESSES EVERY FACT MAY BE CONFIRMED.
Matt 18:17; "If he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector.