Septentrionate, a rarely used word, refers to something pertaining to the north or the northern region. When seeking alternatives to this term, one could opt for the word "boreal". Boreal carries a similar meaning, representing the northern part of the world. Additionally, "northern" can be employed to describe something relating to the north. Nothernmost or northerly can also be used to highlight the most extreme point or direction towards the north. Finally, the term "polar" can be an interchangeable synonym for septentrionate, signifying the cold and icy features associated with the northern regions. These synonyms provide various options when describing the north or its attributes.