Because they have different roots/histories. Like a lot of English word pairs. Just one reason why English is considered widely by linguists to be the richest language.
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Cob is from the OE for spider, cf.
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Corn leaves cobwebs fam
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Spell check
End of conversation
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Cobwebs are old
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Cuz, Hitler built the Berlin Wall to keep Trump's lawyer Ty COBB from starting a WEB Series about Hitler's plan to trick Trump into helping Mexico build a wall to keep the U.S. out...
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A spider web is where the spider is still on it's web when you see it and a cob web is a web that has no spider on it.




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