thunder-heads

thun·der·head

[thuhn-der-hed]
noun Meteorology.
1.
incus ( def 2 ).
3.
the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.

Origin:
1850–55, Americanism; thunder + head

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
thunderhead (ˈθʌndəˌhɛd) [Click for IPA pronunciation guide]
 
n
chiefly (US), (Canadian) the anvil-shaped top of a cumulonimbus cloud

Collins English Dictionary - Complete & Unabridged 10th Edition
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Thunder-heads is always a great word to know.
So is ninnyhammer. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a fool or simpleton; ninny.
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