The word "thirster" is not a widely recognized term in the English language, so it may be challenging to find direct synonyms. However, if we break down the meaning of "thirster" into its constituent parts, we can identify a few related terms. For example, "thirst" is a common word that refers to a strong desire or craving, particularly for water. Therefore, synonyms for "thirster" might include "longing," "craving," "yearning," or "desire." Additionally, we might consider using synonyms for words that are often associated with thirst, such as "drinker," "parched," "dehydrated," or "dry-mouthed." By thinking creatively and considering different angles, we can expand our vocabulary and find suitable synonyms for even obscure words like "thirster".