The word polyglot is a noun. A polyglot is someone who speaks various languages.
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I don't know how a polyglot can get re-elected.
The part of speech that the word my is used as is an adjective.
A suffix changes a word's part of speech. For example, the word 'happy' is an adjective. But when you add a suffix, which is an ending, it can change the part of speech. Happily is an adverb. Happiness is a noun.
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it depends what word it is it could be any part of speech depending on the sentence