the person who has the most important role in a play, movie, or TV showmy cousin is one of the principals in a new sitcom this fall
my cousin is one of the principals in a new sitcom this fall
headliners, leads, stars
leading ladies, leading mensuperstarsingenues(or ingénues), starletsstar turns(chiefly British)coprincipals(or co-principals), costars(or co-stars)
extras, supernumeraries
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