Words That Don't Exist (words used in error)

"momento"   -       This is used mistakenly for "memento," which refers to a
                                souvenir.

"irregardless"   -    I've heard this used for "regardless."

"kudo"   -               From the Greek we have adopted "kudos," a singular word
                                meaning "praise." It ends with the "s" sound as in "gross,"
                                not with a "z" sound.  Kudos from your clients IS a real sign
                                of success.