MUG
MUGEARITE
MUGEARITES
MUGFUL
MUGFULS
MUGG
MUGGA
MUGGAR
MUGGARS
MUGGAS
MUGGED
MUGGEE
MUGGEES
MUGGER
MUGGERS
MUGGIER
MUGGIEST
MUGGILY
MUGGINESS
MUGGINESSES
MUGGING
MUGGINGS
MUGGINS
MUGGINSES
MUGGISH
MUGGS
MUGGUR
MUGGURS
MUGGY
MUGHAL
MUGHALS
MUGS
MUGSHOT
MUGSHOTS
MUGWORT
MUGWORTS
MUGWUMP
MUGWUMPERIES
MUGWUMPERY
MUGWUMPISH
MUGWUMPISM
MUGWUMPISMS
MUGWUMPS

43 words start with MUG.