• hapkito,
• hapkiddo,
• hapkiedo,
• habkido,
• hapikdo,
• hapqido,
• hapkodi,
• hapcado,
• hapkiko,
• hapkisi

• happen,
• hadith,
• habitat,
• apple,
• haptic,
• hippo,
• capo,
• CABO,
• APP,
• abode,
• happening,
• happy,
• happenings,
• happier,
• happily.

The adjective form of the word "hapkido" is "hapkidoin".

The plural form of "hapkido" is also "hapkido".

The singular form of the word "hapkido" remains the same - "hapkido". It is a Korean martial art and does not change in its singular form.