Yes, and this is the whole thing dispensationalists miss.
King James
Acts 7:38 This is he, that was in the church ekklesia in the wilderness with the angel which spake to him in the mount Sina, and with our fathers: who received the lively oracles to give unto us:
New King James and other newer translations.
Acts 7:38 "This is he who was in the congregation in the wilderness . . . .
So when Jesus said I will build my ekklesia the disciples who probably grew up on the Greek NT understood what He was saying. He did not invent a new word.
Too add a little only. The word ekklesia is Greek for assembly or congregation (often translated "church") or alternatively, is qahal in the Hebrew language.
Here's some Old Testament references for the word qahal or church being used for Old Testament Israel:
Deuteronomy 9:10
"And the Lord gave me the two tablets of stone written with the finger of God, and on them were all the words that the Lord had spoken with you on the mountain out of the midst of the fire on the day of the assembly (qahal)."
Deuteronomy 18:16
"Just as you asked of the Lord your God at Horeb on the day of the assembly (qahal), when you said, 'Let me not hear again the voice of the Lord my God or see this great fire anymore, lest I die.'"
Joshua 8:35
"There was not a word of all that Moses commanded that Joshua did not read before all the assembly (qahal) of Israel, and the women, and the little ones, and the sojourners who lived among them."
1 Chronicles 28:8
"Now therefore in the sight of all Israel, the assembly (qahal) of the Lord, and in the hearing of our God, observe and seek out all the commandments of the Lord your God, that you may possess this good land and leave it for an inheritance to your children after you forever."
Psalm 22:22
"I will tell of your name to my brothers; in the midst of the congregation (qahal) I will praise you."
Psalm 107:32
"Let them extol him in the congregation (qahal) of the people, and praise him in the assembly of the elders."
Isaiah 4:5
"Then the Lord will create over the whole site of Mount Zion and over her assemblies (qahal) a cloud by day and smoke and the shining of a flaming fire by night; for over all the glory there will be a canopy."