role-play

Concise Oxford English Dictionary © 2008 Oxford University Press:
role playing (also role play)

▶noun

• 1 chiefly Psychology the acting out of a particular role, either consciously (as a technique in psychotherapy or training) or unconsciously (in accordance with the perceived expectations of society).

• 2 participation in a role-playing game.

– derivatives
role-play verb,
role player noun.