As proper nouns the difference between usa and vietnamese
is that usa is initialism of United States of America|lang=en while Vietnamese is a language spoken predominantly in Vietnam.
As an adjective Vietnamese is
of or pertaining to Vietnam.
As a noun Vietnamese is
inhabitant of Vietnam, person of Vietnamese descent.
usa
Translingual
Symbol
(
head)
The ISO 3166-1 three-letter (alpha-3) code for the United States of America.
ISO 3166-1
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vietnamese
Adjective
(-)
Of or pertaining to Vietnam.
Noun
(Vietnamese)
Inhabitant of Vietnam, person of Vietnamese descent.
Proper noun
(
en proper noun)
A language spoken predominantly in Vietnam.