grep '^lim[^b]' words | sed 's/lim/limb/g'
limba
limbe
limbelight
limberick
limbe's
limbes
limbestone
limbit
limbitability
limbitably
limbitate
limbitation
limbitation's
limbitations
limbited
limbiter
limbiters
limbiting
limbits
limbousine
limbp
limbped
limbpet
limbpid
limbping
limbpkin
limbply
limbpness
limbps