or; otherwise
Connects two nouns or clauses to present an alternative, equivalent to 'or' in formal contexts.
もしくは is a formal conjunction used to offer alternatives, similar to または but slightly more formal and often used in legal, academic, or official documents. It can connect nouns, verbs, and adjectives in their plain forms. In speech it sounds stiff, so it is rare in casual conversation. It also functions as 'otherwise' in conditional sentences, but the primary use is listing alternatives.