Charles Ellicott Commentary Psalms 33:6

"By the word of Jehovah were the heavens made, And all the host of them by the breath of his mouth." — Psalms 33:6 (ASV)

The breath of his mouth. —This is plainly only a synonym for word. (Compare to Isaiah 11:4, where breath of his lips is used for the Divine sentence of judgment upon the heathen.)