Grammatically, "Indonesia" is classified as a proper noun. It is the specific, formal name of a unique geographical and political entitythe Republic of Indonesia. As a proper noun, it refers to this particular country and is therefore always capitalized in written English to distinguish it from common nouns, which name a general class of entities.
While its primary classification is a proper noun, the word can also function as a noun adjunct (or attributive noun). In this role, it modifies another noun to specify a connection or origin, functioning similarly to an adjective. Examples include phrases like "the Indonesia office" or "an Indonesia-based project." This usage is distinct from the derived adjective "Indonesian," which is the standard form for describing attributes, such as "Indonesian culture" or "the Indonesian economy." The use of the base noun as a modifier is a common syntactic construction in English.
Recognizing this grammatical distinction is crucial for maintaining clarity and precision in formal and academic writing. Using "Indonesia" correctly as a proper noun (the subject or object) versus a noun adjunct (a modifier) ensures that statements are unambiguous. This precision is vital in fields such as international law, political science, and journalism, where the distinction between the nation itself and things associated with it must be clear for accurate analysis and reporting.