When referring to a brother who is related by blood or birth, the term "Brother german" is often used. However, there are several synonyms that could be used to refer to him. One of which is "Full brother", referencing the fact that he shares both parents with the speaker. Another synonym is "Fraternal Brother", emphasizing the brotherhood bond. The term "Siblings", while it is a plural form referring to all brothers and sisters in a family, could be used to refer to a brother in certain contexts. Additionally, the term "Blood brother" is often used in certain cultures or contexts to refer to a deep bond of trust between two men who have made a formal or informal pact.