Tantamount to means equivalent to or possessing the same effect as something. There are many synonyms for this phrase that can be used to convey a similar meaning. These include phrases like "equal to," "corresponding to," "on a par with," "commensurate with," and "akin to." Other synonyms for tantamount to are "tantalous," "tantalic," "tantallous," and "tantamountness." These synonyms are particularly useful when writing academic papers or technical documents, where precision in language is crucial. Overall, it is important to remember that using precise and accurate language is essential to conveying the intended meaning clearly and effectively.