13 letter words
CEPHALOTHORAX​30
12 letter words
PNEUMOTHORAX​26
MORPHOSYNTAX​29
PLAGIOCLIMAX​26
11 letter words
HYDROTHORAX​28
SCEUOPHYLAX​28
THOROUGHWAX​28
10 letter words
ANTICLIMAX​21
MESOTHORAX​22
METATHORAX​22
9 letter words (5 words)
DISCLIMAX​21
EARTHFLAX​22
GRAVADLAX​21
PROTHORAX​21
SUBCLIMAX​22
8 letter words (10 words)
PARALLAX​17
SUPERMAX​19
TOADFLAX​19
AFTERTAX​18
BATTLEAX​17
CURTALAX​17
EARTHWAX​21
OPOPANAX​19
SUPERTAX​17
UNDERTAX​16
7 letter words (20 words)
ANTHRAX​17
TELEFAX​17
BEESWAX​19
MINIMAX​18
BROADAX​17
OVERTAX​17
ABRASAX​16
ANTITAX​14
ANTIVAX​17
CARAPAX​18
CHILLAX​19
GRAVLAX​18
OVERLAX​17
PACKWAX​25
PANCHAX​21
POSTTAX​16
SEALWAX​17
TREEWAX​17
WOADWAX​21
WOODWAX​21
6 letter words (18 words)
SYNTAX​16
CLIMAX​17
CARFAX​18
THORAX​16
PRETAX​15
EARWAX​16
SURTAX​13
SMILAX​15
STYRAX​16
NONTAX​13
BANJAX​22
BOMBAX​19
HANDAX​17
LARNAX​13
PAXWAX​25
PICKAX​21
POLEAX​15
STORAX​13
5 letter words (13 words)
RELAX​12
BORAX​14
GALAX​13
PANAX​14
HYRAX​18
ADDAX​14
HAPAX​17
DEWAX​16
LIMAX​14
MALAX​14
RETAX​12
REWAX​15
UNTAX​12
4 letter words
FLAX​14
HOAX​14
COAX​13
3 letter words (10 words)
TAX​10
FAX​13
MAX​12
WAX​13
SAX​10
LAX​10
PAX​12
VAX​13
RAX​10
ZAX​19
2 letter words
AX​9