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That's interesting, where does your long list come from, please?

ACCUSTOM
AD EUNDEM
AD SUMMUM
ALBURNUM
ALLUVIUM
ANEURISM
ANEURYSM
BOTULISM
BROUGHAM
CORUNDUM

DELUBRUM
DILUVIUM
FUTURISM
HALUTZIM
ILLUVIUM
INDUSIUM
LABURNUM
MASURIUM
MOCUDDUM
NATURISM

NEBULIUM
OPIUMISM
PALUDISM
PECULIUM
POPULISM
REFUGIUM
SECUNDUM
SIMULIUM
VIBURNUM

http://www.chambersharrap.co.uk/chambers/puzzles/word_wizards/wwizards.py/main

Great list, but where did you find it, please ... I'm obviously missing a trick!

Oh, the extension of my (limited) knowledge today, thank you so much!

On the link given