Whinny

Part of speech: noun (n.)

The ordinary cry or call of a horse; a neigh. "The stately horse . . . stooped with a low whinny." Tennyson.

Part of speech: verb (v.)

To utter the ordinary call or cry of a horse; to neigh.

Part of speech: adjective (a.)

Abounding in whin, gorse, or furze. A fine, large, whinny, . . . unimproved common. Sterne.