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punctuation
Stealthily is an adverb. The ending "-ly" gives a strong indication of its part of speech.
A noun (like anything ending in -ISM).
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The word "ending" can function as a noun or an adjective, depending on the context.
Adjective. (Words ending in -ous are usually adjectives.)
adjective (like everything ending in -OUS)
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.
Adverb- most words ending in -ly are adverbs.
"Translation" is a noun, as is almost every word ending in -tion.
"prosperous" is an adjective. ( words ending in "ous" are usually adjectives).
'Simply', like many words ending in -ly, is an adverb.