"canker" in the noun sense
a fungal disease of woody plants that causes localized damage to the bark
2. canker, canker sore
an ulceration (especially of the lips or lining of the mouth)
3. pestilence, canker
a pernicious and malign influence that is hard to get rid of
"racism is a pestilence at the heart of the nation"
"according to him, I was the canker in their midst"
"canker" in the verb sense
become infected with a canker
infect with a canker
Source: WordNet® (An amazing lexical database of English)
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