Houyhnhnm
altering
blank cartridge
brood mare
castration
castrato
charger
colt
courser
critter
dobbin
dud
emasculation
entire
entire horse
equine
eunuch
filly
fixing
foal
horse
impotent
incompetent
invalid
mare
mount
nag
neuter
prancer
ridgel
ridgeling
spaying
stallion
steed
stud
studhorse
tarpan
top horse
war-horse
weakling
wild horse
geld
male horse
bull
calve
camel
centaur
chestnut
cob
cow
donkey
ox
palfrey
pony
redhead
roan
steer
unicorn
warhorse