Suffix -ul-.
The suffix "-ul-" denotes a person characterised by the quality, etc.,
which the word expresses, as "justa", just, righteous, "justulo", one
who is just; "babili", to chatter, "babilulo", one who chatters, a
babbler; "avara", avaricious, "avarulo", a miser; "kun", with, "kunulo",
a companion.