The word "re-build" implies the process of reconstructing or repairing something that has been damaged or destroyed. Its antonyms are words that convey the opposite meaning. One such antonym is "destroy," which means to cause something to cease to exist. Another antonym is "demolish," which means to completely destroy a building or structure. "Dismantle" is also an antonym, meaning to take apart or strip something of its parts. "Raze" is another antonym, referring to the act of tearing something down. Finally, "ruin" is another antonym, meaning the destruction or decay of something beyond repair or recovery.