There are several synonyms for the word "amoebae," which is a type of single-celled organism that moves and feeds using pseudopods. One common alternative is "amoeba," which is the singular form of the word. Other synonyms include "ameba," "ameboid," and "amoeboid." These terms are often used interchangeably in scientific literature and can refer to a variety of species within the class Amoebozoa. Some related terms include "rhizopod," which refers to a similar type of single-celled organism that moves using extensions of its cytoplasm, and "protozoan," which is a general term for any single-celled eukaryotic organism.