Must can be an auxiliary verb (Man must eat to live) or an adjective (This is a must book for your reading) or a noun (This rule is a must).
Other meanings of must (all nouns) are:
Tropical in parts of speech
Tropical in parts of speech
a pronoun
Ropnoun
Ropnoun
The word him is a pronoun.
The word him is a pronoun.
The word appropriate has two parts of speech. It can be an adjective and a verb.
there is one part of speech in the word up.
The part of speech for this particular word is a noun.
The word "trudges" is a verb.
Adjective