The words λαός, ἐθνος, δῆμος and ὄχλος are all translated ‘people.' λαός, ‘a people,' is employed often in the LXX to point out God's chosen people Israel, in contrast to the nations around them, for which ἔθνος is used. Thus in Exod. 15:13, 14, "Thou hast led forth by thy mercy the people (λαόν,), whom thou hast redeemed ... . The nations (ἔθνη) heard and were afraid." Moses said, "Both I and thy people (λαός) shall be glorified beyond all the nations (ἔθνη) as many as are upon the earth." Chap. 33:16. When Israel is spoken of as a nation, then ἔθνος is used, see verse 13.
In the N. T. ἔθνος is twice rendered ‘people ': Acts 8:9, referring to the Samaritans, who could not well be called a nation, and who differed from the Gentiles; and Rom. 10:19, which is a quotation from Deut. 32:21. In the plural it is commonly translated ‘Gentiles' as a proper name, and ‘nation' or ‘nations' as an appellative; in a few instances ‘heathen,' but it would be better ‘nations.'
λαός occurs often in the N. T. and is always translated ‘people,' probably with the same general idea as in the O. T.: see Titus 2:14.
δῆμος occurs only in Acts 12:22; 17:5; 19:30, 33. It answers to the Latin populus, free citizens, and is thus employed in these passages.
ὄχλος is the contrast to this, and refers more to the unorganized multitude. It is five times translated ‘press ' and many times ‘multitude' for the people who thronged around the Lord. It is also often translated 'people.'