The difference between Brochure and Junk mail
When used as nouns, brochure means a booklet of printed informational matter, like a pamphlet, often for promotional purposes, whereas junk mail means any mail or letters that are not welcome or solicited and typically sent in bulk.
check bellow for the other definitions of Brochure and Junk mail
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Brochure as a noun:
A booklet of printed informational matter, like a pamphlet, often for promotional purposes.
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Junk mail as a noun:
Any mail or letters that are not welcome or solicited and typically sent in bulk; especially mail of a commercial nature such as advertising circulars and form letters.