Word Puzzle #05- Adding S's -

ANSWER: There are seven words (that we know of) where all three versions of the word are common words:

Bra (-> Bras -> Brass)
Care (-> Cares -> Caress)
Deadline (-> Deadlines -> Deadliness)
Millionaire (-> Millionaires -> Millionairess)
Ogre (-> Ogres -> Ogress)
Prince (-> Princes -> Princess)
Timeline (-> Timelines -> Timeliness)

Thank you Ronald for letting us know about the words bra and millionaire. Thank you Stuart for letting us know about the words care, deadline, ogre, and timeline.