@MrDarcyWillBeMine - honestly you don't sound very respectful.
Nurses and doctors are very different professional and when I chose nursing I didn't do it because I wasn't intelligent enough to be a doctor. A nursing assistant is a completely different role again but the comparison between a nursing assistant and a nurse would have been comparable but not a nurse and a doctor.
And why we have so many "levels" as you put it of nurse is because they can do extra training. Nursing prectricionarers have a similar level of education to doctors, not the same no, but will have done a minimum of 5 years of university, 2 of those post graduate, and they can prescribe but each local authority will put limits on what they can prescribe.
Back to the original post. There is a massive difference between a teaching assistant and a teacher. There roles are different but their responsibilities are an ocean a part. For the most part a TA can leave at the end of the day and that's their job done and that's not the case for teachers. All responsibility ends with the teacher. The obvious like level of education is substantially different.
I worked as a TA for a coupe of years, or it was called pupil support assistant where is worked. There was an attitude of staff that TAs were less and we were often talked down to. I had to point out to one that I was actually more qualified than them and that I had chose this job to fit in with my life at that point and because I hadn't wanted to go back to my previous career. I do get that teachers can be really disrespectful to TAs and that is not right. But I title won't make a difference and you have to respect that the job is different.
I would not appreciate a nursing assistant saying to others they were a nurse, because they are not and there is a massive different in role and responsibility. I don't want someone talking advice from someone without the medical background. They are different roles. Nurses wouldn't manage without nursing assistants in modern day establishments, although they could preform the role, same for teachers preforming the role of TAs but the same is not reversible.
However, everyone should be respected whatever their role.