It depends on how you use it. It can be either a noun or a verb.
Noun: A blast of cold air met her as she opened the door.
Verb: He blasts a horn in his children's ear to wake them.
"Thunderstorm" is a noun.
"Diameter" is a noun.
The word radiance is a noun. The plural is radiances.
Invisibility is a noun.
The word moving is a verb. It is the present participle of the verb move.
Blast can be a noun or a verb: The blast left a crater fifty feet across. The thieves planned to blast through the side of the building to gain access to the vault.
The part of speech for this particular word is a noun.
The part of speech that the word my is used as is an adjective.
H is a letter, not a word. To be a part of speech, it needs to be a word.
The part of speech for the word civilian is English grammar.
The part of speech for the word diplomacy is a noun.
The word speech is a noun.
The part of speech for this particular word is a noun.
The word speech is a noun.
The word speech is a noun.
The word speech is a noun.
What "part of speech" is the word "said?"