a
: one that removes tree stumps
c
: a perplexing or difficult question : poser
a real question … a stumper—Benjamin DeMott
d
: stump speaker
the most indefatigable campaigner and best … stumper—Hodding Carter
e
: one that adjusts the mandrel on a tube-welding machine
f
: an operator of a felting machine
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Merriam-Webster unabridged