Here is a list of Filipino root words that are repeated to make new words (salitang inuulit).  The English definitions of these words are also included.  The list is incomplete, but I hope you will find it helpful in your study.  I am currently working on the list of Filipino compound words (salitang tambalan).  I’ll post it in a few days.

Pagbubuo ng mga Salita_Inuulit