It can be an adverb or an adjective.
Pluto is not an adverb. Pluto is a proper noun being that it is the name of a moon of Saturn.
The words 'this' and 'that' are demonstrative pronouns, adjectives, and adverbs.The demonstrative pronouns take the place of nouns and indicate nearer or farther; for example:I like this better than that.The adjectives describe nouns as nearer or farther; for example:That car is more expensive than thiscar.The adverb modifies a verb or another adverb as more or less in degree; for example:I wasn't expecting this many responses.He makes that much money!
"Nearer" is an adjective.
sometimes and quite are adverbs all the other word are not adverbs.
the heaviest person would have to sit nearer the middle
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Nearer is not a verb and does not have any tenses. Near is a verb, and the past tense is neared.
China is nearer to the North Pole.
Ireland is nearer the equator than Sweden.
As i got nearer to the kitchen, the smell of the pizza sauce smelled even better
Dative ; near Comparative ; nearer Superlative ; nearest .