Deliquesced is an uncommon, scientific term which refers to the action of a substance melting or dissolving into water. However, there are a number of alternative words or phrases that can be used to describe this process. Words such as dissolving, liquefying, melting, or becoming liquid are all possible synonyms. Another possibility might be to speak of something "dissolving into solution" or "breaking down into constituent parts." Depending on the context, other related terms might also be appropriate, such as hydrating, dissolving, or emulsifying. Ultimately, the choice of words will depend on the specifics of the situation and the tone and style of the writing.