Since its agreed that the BoM era predates the NT, the use of either word in the BoM would be suspect.
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Even those many eras of The Book of Mormon predates it does not predate the NT when it was Mormon who;
-abridged their history onto the plates of Mormon
-He inserts the plates of Nephi into the abridgement
-King Benjamin establishes peace in the land. About A.D. 385
you consider they were hid up by Mormon’s son Moroni around 421 AD
Ypu really are just not getting it. The BOM used a word that hadn't been "invented" yet.
Thus, severe doubt is cast upon when it was REALLY written.