Nouns

(n)smear, vilification, malignmentslanderous defamation
(n)smear, cytologic smear, cytosmeara thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope
(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)smearstain by smearing or daubing with a dirty substance
(v)smear, blur, smudge, smutchmake a smudge on; soil by smudging
(v)daub, smearcover (a surface) by smearing (a substance) over it“smear the wall with paint”, “daub the ceiling with plaster”
(v)defame, slander, smirch, asperse, denigrate, calumniate, smear, sully, besmirchcharge falsely or with malicious intent; attack the good name and reputation of someone“The journalists have defamed me!”, “The article in the paper sullied my reputation”