When we talk about someone or something being "by nature", it implies that it is inherent or an essential trait. However, there are several other synonyms that can be used to convey a similar meaning. Some of these include "inherently", "innately", "instinctively", "naturally", "intrinsically", "constitutionally", and "characteristically". All these words can be used to describe a quality or attribute that is an inherent part of a person or thing. Using different synonyms can make the language more diverse and interesting. Hence, it is always good to have an arsenal of words to choose from for effective communication.