Swell can be a noun, adjective and verb.
Noun: A long series of ocean waves.
Adjective: Excellent, great.
Verb: To increase in size.
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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.
for
it depends what word it is it could be any part of speech depending on the sentence
The word power is a noun. The plural form is powers.