When it comes to synonyms for the word "decarbonate", there are several options to choose from. One possible alternative is "decarbonize", which is a term used to describe the removal or reduction of carbon from a substance. Another similar word is "decake", which is typically used in reference to the removal of carbon dioxide from a solid substance. Additionally, "debubble" is another synonym that may be used to describe the process of removing carbonation. No matter which word you choose, the meaning remains the same: some sort of process is being used to remove carbon from a substance and reduce its carbonation.