The word "wetters" can be replaced with different synonyms depending on the context. If you are looking to describe the weather, you can replace it with "rain" or "precipitation". If you are referring to a person who measures humidity, you can use "hygrometer", "humidity sensor" or "moisture detector". If you are referring to a substance that makes something wet, you can use "moisture", "dampness" or "water content". In scientific terms, you may use the word "condensation" to refer to wetness caused by the cooling and solidification of vapor. Regardless of the context, there are many synonyms available for the word "wetters".