Both have been confounded and aspects of one is ascribed to the other.
So which Horus/Heru?; The Elder, The Hawk "Fadi" being the word for "God", Heru-ur "the Great", Heru-merit "Horus of the two Eyes" of the Sun and Moon, Heru-nub "the Golden Horus", Heru-khent-khat, Heru-khent-an-maa "Horus dwelling in blindness", Heru-khuti "of two Horizones, Heru-sam-taui "uniter of North and South"Heru-hekenu, Heru-behutet, or the plain "Horus the Sun god" and "Horus the Son of Osirius and Isis" or Heru-p-khart "Horus the child" also known as Harpocrates whom became an "avenger of his father Osiris"?
Most of these Horuses you list are merely names given to the Horus Harpokrates at different phases of his life. Even Horus 'the elder', (the God of the Sky who flew the deceased to heaven in some myths) was later assimilated with Harpokrates.
With regards to Nephthys, I understand nothing of what SerqSekhet just wrote (Whom's???), but in truth she is seldom mentioned in Egyptian mythology anyway, so there is little to write. She aids Isis in many of her quests, and we learn precious little about her in the Myths of Isis and Osiris, and there is also some interesting material in "The Burden of Isis"
. She also comforts newborn children (Isis is the midwife), and aided Anubis in the wrapping of the deceased. It was after all Nephthys who orginally represented the opposite to Isis- night, decay and darkness. There's loads more info in the book recommended by Maatkara- I got a copy of it for Christmas and it is fantastic.
Oh yeah- and she also features in the Book of the Dead.[/url]