• 知識ちしき — knowledge
• 認識にんしき — recognition, awareness
• 意識いしき — consciousness
• 識別しきべつ — discrimination, distinction
• 常識じょうしき — common sense
• 識者しきしゃ — expert, learned person

識 combines 言 (speech/words) with the phonetic 職 (ショク), indicating clarity in understanding and communication. It developed from the sense of recognizing and remembering, and today appears in education, psychology, and everyday contexts of knowledge and awareness.

彼かれは 知識ちしきが 豊ゆたかです。
He has a wealth of knowledge.

色いろを 識別しきべつする 能力のうりょくを 試ためします。
We’ll test your ability to distinguish colors.