"Whereby" is a conjunction. It is used to introduce a clause that explains the means by which something is done or the manner in which something happens.
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The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.