ATMA
ATMAN
ATMANS
ATMAS
ATMOLOGIES
ATMOLOGIST
ATMOLOGISTS
ATMOLOGY
ATMOLYSE
ATMOLYSED
ATMOLYSES
ATMOLYSING
ATMOLYSIS
ATMOLYZE
ATMOLYZED
ATMOLYZES
ATMOLYZING
ATMOMETER
ATMOMETERS
ATMOMETRIES
ATMOMETRY
ATMOSPHERE
ATMOSPHERED
ATMOSPHERES
ATMOSPHERIC
ATMOSPHERICAL
ATMOSPHERICALLY
ATMOSPHERICS

28 words start with ATM.