AMU
AMUCK
AMUCKS
AMULET
AMULETIC
AMULETS
AMUS
AMUSABLE
AMUSE
AMUSEABLE
AMUSED
AMUSEDLY
AMUSEMENT
AMUSEMENTS
AMUSER
AMUSERS
AMUSES
AMUSETTE
AMUSETTES
AMUSIA
AMUSIAS
AMUSING
AMUSINGLY
AMUSINGNESS
AMUSINGNESSES
AMUSIVE
AMUSIVENESS
AMUSIVENESSES

28 words start with AMU.