According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 16 words with the pattern -O-BY. That is, five letter words with 2nd letter O and 4th letter B and 5th letter Y. In alphabetical order, they are:
bobby
booby
cobby
colby
comby
corby
dobby
forby
gobby
gooby
hobby
lobby
looby
mobby
nobby
womby