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.
Smutch
Part of speech: verb
Definition: To soil, stain or smudge
Part of speech: noun
Definition: A stain, smudge or blot