both

determiner: used with a plural noun to refer to two people or things together
- Both candidates performed well in the interview.
pronoun: two people or things considered together, without naming them
- Both were excited about the results.
adverb: used to indicate that a statement applies to two members of a plural subject or object
- They both agreed to the terms.
conjunction: used with ‘and’ to link two words or phrases, emphasizing that each applies
- The proposal is both ambitious and realistic.