first-class mail vs correspondence

correspondence vs first-class mail

first-class mail and correspondence both are nouns.

Word	Noun	Adjective	Verb	Adverb
first-class mail	Yes	No	No	No
correspondence	Yes	No	No	No

As nouns, correspondence is a hyponym of first-class mail; that is, correspondence is a word with a more specific, narrower meaning than first-class mail:

first-class mail: mail that includes letters and postcards and packages sealed against inspection
correspondence: communication by the exchange of letters

first-class mail (noun)	correspondence (noun)
mail that includes letters and postcards and packages sealed against inspection	similarity by virtue of corresponding
	compatibility of observations
	(mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane
	communication by the exchange of letters
	the relation of corresponding in degree or size or amount

Difference between first-class mail and correspondence

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