According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 39 words with the pattern ---A--H. That is, seven letter words with 4th letter A and 7th letter H. In alphabetical order, they are:
aggadah
ambatch
autarch
breadth
bycatch
catarrh
debauch
endarch
halakah
halalah
halavah
hexarch
inearth
kajawah
mesarch
monarch
navarch
nomarch
pitarah
qabalahrecatch
rematch
repatchscraich
scraigh
scranch
scratch
scrauch
scraugh
splatch
stealth
toparch
triarch
unearthunfaith
unlatch
upcatch
waratah
xerarch