Word: sound in 1 Corinthians

And even things without life giving sound, whether pipe or harp, except they give a distinction in the sounds, how shall it be known what is piped or harped?

1 Corinthians 14:8

For if the trumpet give an uncertain sound, who shall prepare himself to the battle?

1 Corinthians 15:52

In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.