6AIRTHS
6AMRITS
6ARTICS
6CHAIRS
6CHARMS
6CHARTS
6CHASMS
6CHIASM
6CHIMAR
6CHIRMS
6CHIRTS
6CHRISM
6CIMARS
6CRASIS
6CRISSA
6CRISTA
6CRITHS
6HAIRST
6HARIMS
6IHRAMS
6MAHSIR
6MAISTS
6MARISH
6MASTIC
6MATRIC
6MICHTS
6MIRTHS
6MISACT
6RACHIS
6RACISM
6RACIST
6RICHTS
6SAITHS
6SCAITH
6SCARTH
6SCARTS
6SCATHS
6SCHISM
6SCHIST
6SCRAMS
6SCRATS
6SCRIMS
6SHIRTS
6SICHTS
6SIMARS
6SISTRA
6SITARS
6SMARTS
6SMATCH
6SMIRCH
6SMITHS
6STAIRS
6STARCH
6STICHS
6STRICH
6TAISCH
6THAIRM
6THARMS
6THIRAM
6TRIACS
7CHARISM
7CHIASMS
7CHIMARS
7CHRISMA
7CHRISMS
7HAIRSTS
7MAHSIRS
7MASTICH
7MASTICS
7MATRICS
7MISACTS
7MISCAST
7RACISMS
7RACISTS
7SACRIST
7SCAITHS
7SCARTHS
7SCHISMA
7TACHISM
7THAIRMS
7THIRAMS
7THRIMSA
7TSARISM
8CHARISMS
8CHARTISM
8MASTICHS
8SMARTISH
8TACHISMS
8THRIMSAS
9CHARTISMS

Data Gathered from http://www.scrabblist.com