There are various synonyms for the word "abovementioned" that can be used to imply the same meaning in a sentence. Some of these synonyms include aforesaid, aforementioned, previously stated, earlier mentioned, previously discussed, previously described, and earlier referred to. These synonyms can be used to avoid repetition in writing and enhance clarity in sentences. For instance, instead of saying "the abovementioned ideas," one can say "the aforementioned concepts." Using synonyms helps one to express themselves in a better way and make their writing more interesting and readable. It's necessary to use them appropriately and in the right context to achieve the intended message.