noun
a person, place, thing, or idea
adverb
modifies a verb, adjective, or another adverb, typically indicating time, place, manner, or degree
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The two countries have been at war for years, causing immense suffering for their citizens.
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Those two are always at war with each other, they can never seem to get along.
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The rival gangs have been at war on the streets for control of the neighborhood.
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My mind and body are constantly at war with each other, making it hard to find peace.