Spermatozoa are the male reproductive cells responsible for fertilizing the female's egg in sexual reproduction. Though there are no words that could replace "spermatozoa," there are some related terms and synonyms for it. These terms include sperm cells, sperm, male gametes, and sperms. Other identified synonyms include spermatozyme, spermatozoid, and spermatozoon. These words have been used interchangeably to refer to the same concept of male reproductive cells. Moreover, the study of sperm cells and their functions is known as spermatology, which involves the analysis and evaluation of sperm quality, quantity, and morphology.