Firstborn and Senior

Firstborn adjective - First in order of birth.

Senior and firstborn are semantically related. in born earlier topic. In some cases you can use "Senior" instead the word "Firstborn" as an adjective or a noun, when it comes to topics like most senior.

Senior adjective - Being of advanced years and especially past middle age.

Firstborn and senior are semantically related. You can use "Firstborn" instead the word "Senior" as a noun or an adjective.

Nearby Word: seniority