| canker | (noun) a pernicious and malign influence that is hard to get rid of | Synonyms: pestilence |
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| (noun) an ulceration (especially of the lips or lining of the mouth) | Synonyms: canker sore |
| (noun) a fungal disease of woody plants that causes localized damage to the bark | - |
| (verb) infect with a canker | - |
| (verb) become infected with a canker | - |
| cankerous | (adjective) having an ulcer or canker | Synonyms: ulcerated, ulcerous |
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| cankerweed | (noun) herb of northeastern North America having drooping clusters of yellowish-white flowers; sometimes placed in genus Prenanthes | Synonyms: Nabalus alba, Prenanthes alba, white lettuce |
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| cankerworm | (noun) green caterpillar of a geometrid moth; pest of various fruit and shade trees | - |
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