Culm

Definition:

(n.) The stalk or stem of grain and grasses (including the bamboo), jointed and usually hollow.
(n.) Mineral coal that is not bituminous; anthracite, especially when found in small masses.
(n.) The waste of the Pennsylvania anthracite mines, consisting of fine coal, dust, etc., and used as fuel.

Compare culm with other words:

bishopric vs. culm

culm vs. german

anthracite vs. culm

culm vs. culminate