No, the word 'eldest' is an adjective, a word that describes a noun as of the greatest age, an alternate to the adjective oldest.
A pronoun is a word that takes the place of a noun in the sentence.
Example:
Uncle Jack is the eldest member of our family. He is eighty eight.
- the pronoun 'he' takes the place of the noun 'Uncle Jack';
- the adjective 'eldest' describes the noun 'member'.
The word eldest is an adjective. It means "the most old".
adverb
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The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
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adverb
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech of "came" is a verb.
The part of speech for "buried" is a verb.