Yes, "soonest" is a word in the English language. It is an adverb that means in the shortest time from now or earliest after the present.
The hunter stalked silently through the forest, eyes trained on its prey.
She was able to achieve her goals through clever manipulation of the situation.
This is a sentence using a pronoun.The word this is a demonstrative pronoun.
The pupil in my class raised her hand to answer the question.
She tried to reach her home soonest. This is an example sentence using the word soonest.
My friend called me stating that his car broke down so I told him I was having dinner with my family and the soonest I could pick him up would be around 8:00 pm.
She was the soonest to finish the assignment. The red car was the soonest across the finish line.
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I am not writing a sentence using that word.
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