The word "but" is a conjunction part of speech in the sentence "Three people applied for the position, but none of them were qualified".
But is a coordinating conjunction that joins concepts that are in opposition. This kind of conjunction joins grammatically equivalent elements, such as two words, two phrases, or two separate clauses.
The clause "Three people applied for the position" is an independent clause. The coordinating conjunction ,which is a part of speech, "but" is joining another clause that is "none of them were qualified". Both the clauses are in contrast with each other that there were three applicants for the job, but none of them qualified.
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