According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -T--A--H. That is, eight letter words with 2nd letter T and 5th letter A and 8th letter H. In alphabetical order, they are:

ethnarch

At least 1,454, depending which dictionary you use. Here are some:

ancestry

aneurysm

cashment

centaury

chummery

cyanuret

ethnarch

ethnarchy

etruscan

hatchery

hauncher

hyraceum

mamercus

maumetry

maytenus

merchant

mustache

ramentum

recusant

resnatch

sarmentum

scytheman

snatcher

stancher

staucher

thearchy

unchaste

unhearty

unmaster

unstarch

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern ---N--CH. That is, eight letter words with 4th letter N and 7th letter C and 8th letter H. In alphabetical order, they are:

ethnarch

penneech

topnotch

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ET--A--H. That is, eight letter words with 1st letter E and 2nd letter T and 5th letter A and 8th letter H. In alphabetical order, they are:

ethnarch

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -TH-A-C-. That is, eight letter words with 2nd letter T and 3rd letter H and 5th letter A and 7th letter C. In alphabetical order, they are:

ethnarch