Nouns

(n)smudge, spot, blot, daub, smear, smirch, slura blemish made by dirt“he had a smudge on his cheek”
(n)blot, smear, smirch, spot, stainan act that brings discredit to the person who does it“he made a huge blot on his copybook”

Verbs

(v)blotdry (ink) with blotting paper
(v)spot, fleck, blob, blotmake a spot or mark onto“The wine spotted the tablecloth”