Lustral is a word that means pertaining to purification, purification by washing or cleansing, or suggestive of or conducive to spiritual purification. While it may not be a commonly used word, there are several synonyms that can be used in its place. Some of these synonyms include cleansing, purifying, expiating, sanctifying, washing, ablution, bathing, and purification. These synonyms can be used interchangeably depending on the context in which the word is used. For example, one might say a lustral ceremony was performed to sanctify the space, or a purifying ritual was performed to cleanse the area. Overall, there are many synonyms that capture the essence of the word lustral, making it a versatile term in the English language.