• 忠誠ちゅうせい — loyalty, allegiance
• 忠実ちゅうじつ — faithful, devoted
• 忠告ちゅうこく — advice, warning
• 忠義ちゅうぎ — loyalty and righteousness
• 忠魂ちゅうこん — loyal soul, loyal spirit

忠 combines the heart radical (心) with the sound element 中 (center). It reflects a heart that is centered, honest, and committed — expressing sincerity and loyal intent from within.

彼かれは 国くにに 忠ちゅうを 尽つくした。
He devoted his loyalty to his country.

忠告ちゅうこくをありがとう。
Thank you for the advice.

チュウ is the on-yomi used in compound words like 忠誠 and 忠告. This kanji is mostly seen in formal or written contexts related to devotion and moral duty.