Yes, you would just have to add your letters onto the end of an existing word, but so that it's still a legitimate word word.
EXAMPLE:
Word on the board = nation (six letters)
You add "als" to make = nationals (nine letters)
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According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern AI-----A-. That is, nine letter words with 1st letter A and 2nd letter I and 8th letter A. In alphabetical order, they are: airstream
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -----IC-A. That is, nine letter words with 6th letter I and 7th letter C and 9th letter A. In alphabetical order, they are: simplicia
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---MI---A. That is, nine letter words with 4th letter M and 5th letter I and 9th letter A. In alphabetical order, they are: primipara
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ----X-CA-. That is, nine letter words with 5th letter X and 7th letter C and 8th letter A. In alphabetical order, they are: indexical
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern A----U--H. That is, nine letter words with 1st letter A and 6th letter U and 9th letter H. In alphabetical order, they are: alleluiah