Naturally, all are spelled without vowels!
LNCN, CVLWR, BTTLFLD, GNRL, GMD, BRHM
The two longest words CVLWR (5 letters) and
BTTLFLD (7 letters) are actually a part of
Lincoln’s speech, not code, so their appearance
is not particularly surprising.
The same can be said for Drosnin’s “assassin
that will assassinate” in Deut 4:42, part of a
regulation for fleeing to a city of refuge by a
“killer that has killed.”