How to say "nurture" in Japanese

• 育成いくせいJLPT N1approx.Common
  noun, suru verb, transitive verbCovers 'nurture' as rearing, training or cultivation — deliberately developing people, talent or ability, often in organizational or institutional contexts of training someone up.
  ワインにはいろいろなタイプがあり、それによって育成いくせいの仕方しかたもさまざまです。↗

  There are various types of wines and the way they are matured varies accordingly.
• 育むはぐくむCommon
  godan verb, transitive verbThe verb sense of 'nurture': to foster or cultivate something patiently so it grows, such as talent, feelings, or relationships; carries a warm, caring nuance.
  スポーツは友情ゆうじょうをはぐくむものだ。↗

  Sports nurture friendships.
• 養いやしないCommon
  nounPoints to the 'bringing up and rearing' sense — nurturing someone by feeding and raising them, as a parent does a child; less apt for cultivating skills or feelings.

For 'nurture' as the act of training or developing people or talent, 育成 fits best; for actively cultivating growth of people, skills or feelings, use the verb 「育む」; 「養い」 centers on bringing someone up and providing for them.

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

• 育成いくせいrearing
• 育てるそだてるto promote the growth of
• 育むはぐくむto cultivate
• 培養ばいようcultivation (e.g. of a skill)
• 養いやしないbringing up