The word "percolable" means something that can be passed through, or filtered. Synonyms for this word include "filtrable," "penetrable," "porous," "sieveable," "drainable," "permeable," and "passable." These words describe materials or substances that allow liquids or gases to pass through them easily. "Filtrable" refers to the ability to be filtered, while "penetrable" and "porous" refer to materials that allow substances to pass through them without creating a blockage. "Sieveable" and "drainable" refer to objects that can be filtered through a sieve or a drain. "Permeable" and "passable" refer to substances that allow other substances to pass through them easily.