There are many synonyms for the term "test subjects" which is commonly used to refer to individuals or animals that are used in experiments or trials to determine their response to certain variables. Some synonyms for this term include experimental participants, research subjects, study subjects, trial participants, laboratory animals, research animals, and animal models. These terms are often used in scientific research, clinical trials, and medical studies to refer to the individuals or animals who are being tested in order to obtain important data and results that can be used to help improve the quality of life for others. No matter which term is used, the important thing is to ensure that these individuals and animals are treated with care and respect throughout the testing process.