Disappointment is a noun. The suffix "-ment" is used to form nouns, so if you see a word ending in "ment", it is likely to be a noun. For example, "amuse" is a verb, but "amusement" is a noun.
adverb
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"Oh" is an interjection. It is used to express emotions like surprise, excitement, or disappointment.
Sadly is an adverb. It is used to modify or describe verbs, adjectives, or other adverbs by indicating a sense of sorrow, regret, or disappointment.
"Aw" is typically used as an interjection in informal language to express sympathy, tenderness, or disappointment. It is not a formal part of speech like a noun or verb.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
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adverb
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The part of speech for "explicit" is an adjective.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "buried" is a verb.