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.