fuligin, fulgurator

Steve wrote: I was looking up the word 'fuligin' in the dictionary the other day. I was interested to see that sitting right in front of the 'fuligin'-like words (namely, 'fuliginated', meaning 'of a sooty color or appearance'; 'fuligo', meaning 'soot'; and 'fuliginous', meaning 'blackened with soot'), there were were several similar sounding words derived from a root with a quite different meaning. These were 'fulgurate' ('emit flashes like lightening'); 'fulguration' ('the action of lightening'; 'in assaying, a brightening in the appearance of a molten metal'); 'fulgurous' ('resembling, full of or charged with lightening').