Haptenize is a term used to describe the process of chemically modifying a substance, such as a protein, to make it more immunogenic. However, there are several other phrases and words that could be used in place of haptenize, such as conjugate, modify, sensitize, or immunize. Each of these words carries a slightly different connotation and may be better suited in certain contexts. For example, "conjugate" may be used to describe the process of linking two substances together, while "immunize" may imply a more widespread protection against a pathogen. Nonetheless, all of these synonyms convey the idea of making a substance more reactive with the immune system.