"Dutch cap" is a term for a contraceptive diaphragm. There are several synonyms for this term such as cervical cap, fem cap, Lea's shield, and barrier method. All of these devices work by covering the cervix to block the sperm from entering the uterus. In addition, the term "condom" is also a type of barrier method that works by covering the penis to prevent semen from entering the vagina. While Dutch cap and its synonyms are effective methods of contraception, they do not protect against sexually transmitted infections. It's important to speak with a healthcare provider to determine the best method of contraception for individual needs.