The word “penis” is a term for the male reproductive organ. Some synonyms for “penis” are “phallus”, “member”, and “organ”.
“Phallus” is a more formal or technical term. It is often used in scientific or academic contexts. For example, “The study focused on the anatomy of the phallus.”
“Member” is a somewhat euphemistic term. It can be used in more polite conversation. “He was concerned about the health of his member.”
“Organ” is a general term that can refer to any body part. In the context of the male reproductive system, it can be used to refer to the penis. “The doctor examined the organ for any signs of disease.”
It's important to note that these terms are often used in different contexts and with different levels of formality. Additionally, discussions about such topics should be done in an appropriate and respectful manner.