different between modillion vs dutchman

English

Borrowed from Italian modiglione. Doublet of moellon.

modillion (plural modillions)

(architecture) A decoratively carved supporting block atop a column.
- 1922, Claude Fayette Bragdon in The Beautiful Necessity: Seven Essays on Theosophy and Architecture, Essay II, Unity and Polarity
  The familiar classic console or modillion is an example: although in general contour it is well adapted to its function as a supporting bracket, embedded in, and projecting from a wall, yet the scroll-like ornament with which its sides are embellished gives it the appearance of not entering the wall at all, but of being stuck against it in some miraculous manner.

From Dutchman. Attested mainly in the US from the late 19th century.

dutchman (plural dutchmen)

(carpentry, masonry) A piece of wood or stone used to repair a larger piece, shaped such that it fills as exactly as possible a void or cavity that is to be repaired.
A flaw or void repaired with such a piece.
(theater) A cloth strip attached to a flat to conceal a joint.
(nautical) Ellipsis of Flying Dutchman: a ghost ship

Oxford English Dictionary, 1884–1928, and First Supplement, 1933.
John Russell Bartlett (1884) Dictionary of Americanisms, page 196: “Dutchman. A flaw in a stone or marble slab, filled up by an insertion.”

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