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It's a noun. A full sentence needs only a subject (noun) and a verb, and you can say, "Compassion exists." Therefore, since "exist" is a verb, "compassion" is a noun. You can use that trick for lots of words, and conversely, if it doesn't fit in a two-word sentence like that then you know it isn't a noun or a verb.
What else can I help you with?
What is the proper part of speech for compassion?
Compassion is a noun.
What part of speech is the word moments?
The part of speech for this particular word is a noun.
What part of speech is the word my-?
The part of speech that the word my is used as is an adjective.
What part of speech is H?
H is a letter, not a word. To be a part of speech, it needs to be a word.
What part of speech is the word diplomacy?
The part of speech for the word diplomacy is a noun.
What is the part of speech for the entry word boulevard?
The part of speech for the word "boulevard" is a noun.
What is the part of speech for the word civilian?
The part of speech for the word civilian is English grammar.
What part of speech is speech?
The word speech is a noun.
What part of speech is stroobly?
It is not ANY part of speech, there is no such English word as "stroobly".
What is the part of speech of momentous?
The part of speech for this particular word is a noun.
What part is speech is is?
The word speech is a noun.
What part of speech is (THE)?
The word speech is a noun.
