The job, or function, of a word is what gives the label for its part of speech. English has eight parts of speech which are:
Adjectives describe or modify nouns and pronouns.
This is a round bottle.
The pencil is long.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.