We don't have synonyms for filabuster yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are filibuster, fillabuster and fillibuster.
(n) :
Misspelling of filibuster. [(historical) A mercenary soldier; a freebooter; specifically, a mercenary who travelled illegally in an organized group from the United States to a country in Central America or the Spanish West Indies in the mid-19th century seeking economic and political benefits through armed force.]
(n) :
Misspelling of filibuster. [(historical) A mercenary soldier; a freebooter; specifically, a mercenary who travelled illegally in an organized group from the United States to a country in Central America or the Spanish West Indies in the mid-19th century seeking economic and political benefits through armed force.]