Smudge
Part of speech: noun
Definition: A blemish; a smear. Dense smoke, such as that used for fumigation.
Part of speech: verb
Definition: To obscure by blurring; to smear. To soil or smear with dirt. To use dense smoke to protect from insects.
Blot
Part of speech: noun
Definition: A blemish, spot or stain made by a coloured substance.A stain on someone's reputation or character; a disgrace.The Southern blot analysis (and derived Northern and Western) analytical techniques.an exposed piece in backgammon.
Part of speech: verb
Definition: to cause a blot (on something) by spilling a coloured substanceto soak up, or absorb liquidto hide, obscure or obliterate something