13 letter words
MULTIMEGAWATT​21
11 letter words
SCUTTLEBUTT​15
ANTIBOYCOTT​18
10 letter words
ALBUMBLATT​16
WOOLLYBUTT​18
9 letter words (4 words)
BLACKBUTT​19
MILLIWATT​14
MICROWATT​16
POLYGLOTT​15
8 letter words (11 words)
KILOWATT​15
MEGAWATT​14
GIGAWATT​13
QUARTETT​17
QUINTETT​17
FOREBITT​13
FORSWATT​14
NANOWATT​11
RETRAITT​8
SEMIMATT​12
TERAWATT​11
7 letter words (10 words)
BOYCOTT​14
BASSETT​9
KENNETT​11
BABBITT​13
CORNETT​9
BOBBITT​13
RACKETT​13
SESTETT​7
SEXTETT​14
WADSETT​11
6 letter words (9 words)
DEWITT​10
ABWATT​11
ASSOTT​6
DOMETT​9
KAPUTT​12
MOTETT​8
OCTETT​8
SCEATT​8
UNBITT​8
5 letter words (16 words)
PRATT​7
PLATT​7
BRITT​7
STOTT​5
BLATT​7
KLETT​9
SHOTT​8
DUETT​6
ARETT​5
CHOTT​10
FLITT​8
FRITT​8
GAITT​6
SCATT​7
SKATT​9
TRATT​5
4 letter words (21 words)
MATT​6
BUTT​6
WATT​7
MUTT​6
PUTT​6
MOTT​6
MITT​6
BATT​6
BOTT​6
FETT​7
NETT​4
SETT​4
NOTT​4
COTT​6
POTT​6
FITT​7
DITT​5
TATT​4
RITT​4
BITT​6
3 letter words
ATT​3