cheval et chevaux

I was looking for the word "horse" or "cheval" and wanted to know if it is masculin or feminine. A good friend helped and sent me these words that I didn't know before:
French                             English          
cheval         nm.                horse
chevaux      nmpl.             horses
Étalon         nm.               stallion
jument         nf.                 mare
hongre        nm. ou adj.    gelding