What is the difference between a Senior Enlisted Leader (SEL) and a Senior Enlisted Advisor (SEA) in the military?

Words have meaning, especially in the military, and there are some official titles with one of each of the words in our profession. Another thing about our great military is that nearly every word that the untrained eye would consider a buzzword is actual doctrinal (i.e. BLUF). Ill check FMSweb. I am sure there is doctrine that specifies the answer to my question and yes I was already guessing what you posted.

The 'leadership' vs 'non-leadership' analogy appears logical, but I would also like to see some doctrine support. As an Army SFC I worked in a position where I was the senior enlisted person. I was referred to by both titles, depending on the service and position/rank of the person. The actual position was in civilian clothes at an off-post site and uniformed on post/base. When attending meetings with others in similar positions on post/base, I was the only non-SGM (E-9) in attendance. I asked the group (almost a dozen) at the meetings ref the difference in titles and received varying responses. The consensus at the meeting was that, for me (my situation), the titles were interchangeable. Smiles all around as if to indicate 'it doesn't really matter'. Again, it would be interesting to find doctrine in writing for support/background.