The difference between Cancer and Lichen
When used as nouns, cancer means a disease in which the cells of a tissue undergo uncontrolled (and often rapid) proliferation, whereas lichen means any of many symbiotic organisms, being associations of fungi and algae.
check bellow for the other definitions of Cancer and Lichen
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Cancer as a noun (medicine, oncology, disease):
A disease in which the cells of a tissue undergo uncontrolled (and often rapid) proliferation.
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Cancer as a noun (figuratively):
Something damaging that spreads throughout something else.
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Lichen as a noun:
Any of many symbiotic organisms, being associations of fungi and algae; often found as white or yellow patches on old walls, etc.
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Lichen as a noun (figurative):
Something which gradually spreads across something else, causing damage.