What's the difference between hommock and hummock?

Hommock

Definition:

(n.) A small eminence of a conical form, of land or of ice; a knoll; a hillock. See Hummock.

Example Sentences:

Definition:

(n.) A rounded knoll or hillock; a rise of ground of no great extent, above a level surface.
(n.) A ridge or pile of ice on an ice field.
(n.) Timbered land. See Hammock.

Example Sentences:

(1) He wondered what had happened to the land, its fish-filled inlets, the shrimp-spawning marsh, the oak groves, the hummocks overrun with white egrets, how a place that fed so richly whoever sailed through it could dissolve, history and graveyard and church and road and home.
(2) Reaching an open area of sparse trees beside the track, we set off across a large clearing of soft hummocks.
(3) Highest densities were located on the sloping banks of hummocks, ponds and potholes.