According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern T-RP-N-. That is, seven letter words with 1st letter T and 3rd letter R and 4th letter P and 6th letter N. In alphabetical order, they are:

tarpans

tarpons

terpene

There is alot of horse breeds. Each horse breed is good for different skills. A Lipizzaner is very good at performing in Spanish riding schools. Arabian horses are prized for its speed and stamina. Clydesdales are good at pulling heavy carts through streets. Knabstrups are used manly used as circus horses. And lastly the Tarpans are horses that have died out in the year 1879. So you can't really say how much breeds, but there is about over 100 breeds.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 21 words with the pattern T--PA--. That is, seven letter words with 1st letter T and 4th letter P and 5th letter A. In alphabetical order, they are:

taipans

tampala

tampans

tarpans

taupata

taxpaid

teopans

timpana

timpani

timpano

towpath

trapans

trepang

trepans

tripack

tripart

tympana

tympani

tympano

tympans

tympany

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 21 words with the pattern --RP-N-. That is, seven letter words with 3rd letter R and 4th letter P and 6th letter N. In alphabetical order, they are:

burping

carping

forpine

gorping

harping

harpins

jarping

kirpans

parpane

parpend

parpens

parpent

parping

perpend

perpent

serpent

tarpans

tarpons

terpene

warping

yorping

All modern horses with the same chromosome count can interbreed and produce fertile offspring. Breeds, such as the Clydesdale are merely examples of how a

very diverse gene pool can be manipulated to produce a more genetically uniform

group of individuals through inbreeding, line breeding and consistent selection

for characteristics by the breeder/breed organization.

The other Equids: Donkeys, Asses, zebras, tarpans, tahkis have different chromosome counts and interbreeding of any of these species (modern horses included) rarely if ever produces fertile offspring...or any offspring in some cases.