Synonyms of 'ensign'
a merchant ship flying the blue ensign of a fleet auxiliary
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A banner is a long strip of cloth with something written on it. Banners are usually attached to two poles and carried during a protest or rally.
A big banner was draped across one of the streets.
A flag is a piece of cloth which can be attached to a pole and which is used as a sign, signal, or symbol of something, especially of a particular country.
They raised the white flag in surrender.
Thesaurus for ensign from the Collins English Thesaurus
An ensign is a flag flown on a ship to show what country the ship belongs to.