• carcioid,
• cardiide,
• cardiida,
• dardioid,
• cardeioid,
• cardioids,
• cardiod,
• c ardioid,
• carditis,
• acarroid,
• carraboid,
• cirsioid,
• natcioid,
• Pardifoil,
• spardoid,
• calcoiid,
• cardiotimy,
• varioid,
• varricoid,
• lepdioid

• cardiidae,
• carditis.

The adjective form of the word "cardioid" is "cardioidal".

The plural of the "cardioid" can be the "cardioids".

The singular of the "cardioid" can be the "cardioid".