There are many synonyms for the word "recognizer," depending on the context in which it is used. In general, a recognizer is someone or something that identifies or acknowledges a person or thing. Synonyms for recognizer include identifier, verifier, validator, detector, and more. For example, a facial recognizer is a technology that identifies individuals based on their facial features. Similarly, a voice recognizer is a tool that recognizes a person's voice and can be used for various purposes. Other synonyms for recognizer might include the words assessor, appraiser, or evaluator, all of which suggest a process of judging or assessing something or someone for its qualities or characteristics. Ultimately, the choice of synonym for "recognizer" depends on the specific meaning that one wants to convey.