An avenue is a wide street or main thoroughfare, per the Related
Link, listed below:
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Avenue refers to a "wide street or main thoroughfare"
(definition from dictionary.com). A street is smaller, less busy,
and usually narrower.
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downing street
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Main Street is what many towns call their most important street
- the main thoroughfare. It figuratively stands for Small Town
America - the old-fashioned towns that used to exist throughout the
country.