How to say "co-star" in Japanese

• 顔を合わせるかおをあわせる
  expression, ichidan verbCovers the sense 'to co-star; to appear together', with two actors or performers sharing a production. Tagged less common, so it is not usually the first word learners reach for; also regularly means simply 'to meet face to face'.
• 顔合わせるかおあわせる
  ichidan verb, intransitive verbSame sense as 顔を合わせる — two performers appearing together — but written without the particle を. It is also tagged less common, so it is a marginal way to express 'co-star' rather than a go-to choice.
• 顔を合わすかおをあわす
  expression, godan verbAlso glossed 'to co-star; to appear together', but tagged less common and using the shorter verb form 合わす. For 'co-star' it is seldom the word you want; it is better known in the sense of meeting someone in person.

All three share the same sense 'to co-star / appear together'; they differ mainly in form, and all are tagged less common, so none is a primary choice for 'co-star'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 顔を合わせるかおをあわせるto co-star
• 顔合わせるかおあわせるto co-star
• 顔を合わすかおをあわすto co-star