Elephant's is a possessive form of the word elephant, which means a large mammal with a long trunk and large ears. There are several synonyms that can be used instead of elephant's in various contexts. For instance, the term pachyderm refers to any large, thick-skinned mammal, including elephants. Another synonym for elephant's might be tusked, which would pertain to the long, ivory tusks that elephants possess. Additionally, the word pachydermatous means having thick skin, and could be used in place of elephant's skin. Meanwhile, words like mammoth, giant, and behemoth could all be used as synonyms for elephant in the context of size and weight.