An arrish is an alternative term for an earsh, an archaic term for a stubble field.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ARR-SH. That is, six letter words with 1st letter A and 2nd letter R and 3rd letter R and 5th letter S and 6th letter H. In alphabetical order, they are: arrish
hashish seventh through AARRGHH ABOLISH ABROACH ABSINTH ACALEPH ACOLYTH AGGADAH AGOROTH ALANNAH ALENGTH ALIYOTH ALMIRAH ALUMISH AMBATCH ANGUISH APPEACH ARDRIGH AUTARCH AZIMUTH BABOOSH BABYISH BADDISH BADMASH BAGWASH BALDISH BARDASH BATFISH BEAMISH BEARISH BEAUISH BEGORAH BEMOUTH BENEATH BERDASH BESEECH BETROTH BEWITCH BIGGISH BILLYOH BIMORPH BIOTECH BISMUTH BLEMISH BLOKISH BLUEISH BOARISH BOBBISH BOGGISH BOOBISH BOOKISH BOORISH BOROUGH BORSHCH BORTSCH BOXFISH BRACHAH BRAUNCH BREADTH BRINISH BRUTISH BUCKISH BUDMASH BULLISH BULRUSH BURDASH BURNISH BUSHWAH BYCATCH CADDISH CANNACH CAPOUCH CARLISH CAROACH CARROCH CARWASH CATARRH CATFISH CATTISH CEILIDH CHALLAH CHALOTH CHAVISH CHEETAH CHERISH CHUDDAH CHUMASH CHUPPAH CLAYISH CLERUCH COCKISH CODFISH COLDISH COLTISH COOLISH COWFISH COWITCH CRAUNCH CRONISH CUBBISH CULTISH CURRACH CURRAGH CURRISH DAMPISH