Would this “improper noun” concept be an extension of “term of art” (which is also used in the article) ? I fully agree with the author, on the importance of b

Would this “improper noun” concept be an extension of “term of art” (which is also used in the article) ? I fully agree with the author, on the importance of being aware they exist. The insure example is apt, and people also get tripped by law and contracts wording that refer to specific concepts which are barely related to the word used.