N on n
The 'stain' group
These nouns refer to a mark or a non-physical blemish.
blemish blot bruise cut excrescence mark scar stain
The only blemish on his record was his dismissal for punching during France's 18-16 defeat by Canada in Ontario.
'The Voyager tragedy is a blot on Australia's proud military history,' he said.
I realized that the stains on Constant's shirt were blood.