ひよこ・雛hiyoko[1]atamadaka (head-high)

1. nounyoung bird; chick; fledgling
   ヒヨコが餌えさを探さがして地面じめんをつついている。↗

   The chickens were scratching for food on the ground.
2. noungreenhorn; fledgeling; novice; rookie; juvenile
   ルチアーノは大だい声援せいえんを背負せおって戦たたかえるかもしれないが、彼かれはまだヒヨコに過すぎない。↗

   Luciano might have the crowd behind him, but he's still wet behind the ears.

• Synonym雛鳥ひなどりNeutralGeneric for a bird soon after hatching, of any species; 「雛」 read ひよこ mostly means a baby chicken and figuratively a beginner.
• Antonym親鳥おやどりNeutralThe bird that raises its chicks — the parent, standing opposite 「雛」.
• Antonym成鳥せいちょうWrittenA written, formal word for a fully grown adult bird; the opposite of 「雛」.

Default to 「雛」/「ひよこ」 for a chick or, figuratively, a beginner; pick 「雛鳥」 for a newly hatched bird of any kind. 「親鳥」 and 「成鳥」 are the opposites: the parent bird and the fully grown adult.

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

1. ひな、ひよこ。
2. ちいさい、かわいらしいという意味いみ。