My aunt is a member of Phi Delta Kappa Sorority Inc.
I asked her about the name thing being that they both are related to education (one can get EXTREMELY confused), and she said her organization is a sorority where as the other is a fraternity (one major difference). She also said her org is national and the fraternity is international. She finally said what is offered with her sorority is different than what is offered in the fraternity (but she got kinda spacey on the details...I wonder why
)