It depends on the context. It can be a noun ("That was a year of great content"), a verb ("Content yourself with only one sweet") or an adjective ("He was a content man").
The word "curriculum" is a noun. It refers to the subjects and content taught in a school, course, or educational program.
Contented can be an adjective and a verb. Adjective: Satisfied. Verb: The past tense of the verb "content".
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "breezy" is an adjective.