κῦμα

Matthew 8:24 κυμάτων· waves;

Suddenly a violent storm came up on the sea, so that the boat was engulfed by the waves. But Jesus was sleeping.

Here: Waves, especially swelling or breaking waves. The plural pictures wave after wave coming over the sides.

Matthew 14:24 κυμάτων· waves;

but the boat was already far from land, buffeted by the waves because the wind was against it.

Here: Waves whipped up by the wind. Matthew used the same word in the earlier storm scene (8:24), where the boat "was being covered by the waves".

Mark 4:37 κύματα waves

Soon a violent windstorm came up, and the waves were breaking over the boat, so that it was being swamped.

Here: Breaking waves. The word is plural, but its verb is singular, as Greek normally does with neuter plurals. The picture is of the whole mass of water striking the boat.

Acts 27:41 κυμάτων. waves.

But the ship struck a sandbar and ran aground. The bow stuck fast and would not move, and the stern was being broken up by the pounding of the waves.

Here: The breakers from the storm that had been driving the ship for two weeks (27:27). Some manuscripts leave this word out.

Jude 1:13 κύματα waves

They are wild waves of the sea, foaming up their own shame; wandering stars, for whom blackest darkness has been reserved forever.

Here: The swelling waves of open water. Jude carries on his string of nature pictures from verse 12 ("these are..."), so the waves are the false teachers themselves.