The noun 'river' is a singular, common, concrete noun; a word for a body of water, a thing.
When the noun 'river' is the name of a person, place, thing, or a title, it is a proper noun. Examples:
The noun 'river bank' is a singular, common, concrete, compound noun; a word for a thing.
River is a noun.
concrete noun
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
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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.
what part of speech is beneath
what part of speech is work
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.