Synonyms for senior Found 6 synonyms across 3 meanings for “senior”. a person who is older than you are (noun) elder used of the fourth and final year in United States high school or college (adj) senior(a)fourth-year advanced in years (adj) agedelderlyolder Explore Related Words Rhymes with seniorSynonyms for elderSynonyms for senior(a)Synonyms for fourth-yearSynonyms for agedSynonyms for elderly Synonym Finder | Rhyme Finder | Poetry Editor