Shown is the past participle of the verb show.
The part of speech shown on the dictionary entry for the word "vestibule" is a noun.
The word "superficial" is shown on the dictionary entry as an adjective.
The word "superficial" is an adjective.
A dictionary will tell you the part of speech for each word. For example, the entry for "dictionary" will state noun.
Vial comes up as a noun.
The word "superficial" is typically listed as an adjective in a dictionary entry.
verb
The word experimen can be a noun or a verb.
The word 'applause' is a noun, a word for approval shown by clapping hands; a word for any positive expression of appreciation or approval; a word for a thing.
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.