1) Equineutterance 1) Ask for hay 2) Bay sound 3) Broken hinge produces whinny 4) Call from a stall 5) Chestnut sound 6) Comment from Dobbin 7) Common Arabian utterance 8) Cry of a horse 9) Derby sound 10) Equine comment 11) Equine negative 12) Equine noise 13) Equine refusal 14) Greeting for the groom 15) Greeting to a rider 1) Nicker 2) Ponyexpression 3) Whicker 4) Whinny 
• (v. i.) To utter the cry of the horse; to whinny. • (v. i.) To scoff or sneer; to jeer. • (n.) The cry of a horse; a whinny. • (v. i.) To utter the cry of the horse; to whinny. • (n.) The cry of a horse; a whinny. • (v. i.) To scoff or sneer; to jeer.
Neigh (nā) intransitive verb [ imperfect & past participle Neighed (nād); present participle & verbal noun Neighing .] [ Middle English neien , Anglo-Saxon hnǣgan , probably of imitative origin; confer M...Neigh noun The cry of a horse; a whinny. 
[n] - the sound made by a horse 2. [v] - characteristic of horses
nicker noun the characteristic sounds made by a horse
to utter the cry of a horse; whinny.