"Soaking" is a verb that refers to the act of making something completely wet by immersing it in a liquid. However, there are many other words that can be used instead of "soaking" to convey the same meaning. "Drenching" is a great synonym for "soaking" as it describes the action of making something wet by pouring or spraying water over it. "Saturating" is another good option as it connotes the idea of completely filling or blending something with liquid. "Immersing," "submerging," "dipping," and "plunging" all describe actions that can cause something to become fully saturated with water and are also useful synonyms for "soaking".