its used in different context in both verses.
in the verse in revelation its used to identify the light of the dawn or the rising sun.
in the verse in isaiah its used metaphorically.
reading the same verse from the KJV:
isaiah 14:12-15
How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations! 13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north:
14 I will ascend above the heights of the clouds; I will be like the most High.
15 Yet thou shalt be brought down to hell, to the sides of the pit.
NIV = morning star, son of the dawm
KJV = lucifer, son of the morning
so we could say that lucifer = morning star
but again, the term "lucifer" or "morning star" are being used metaphorically.
keep in mind that this is no longer what the fallen angel is called. his moniker is now "satan" or "the opposer" in his disgrace.
the moniker was bestowed upon Jesus in being described as the morning star.
this does not mean that Jesus and satan are the same person.
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