• nac,
• naks,
• nak,
• knack,
• nnak,
• nacq,
• nzck,
• nqck,
• naxk,
• nacj,
• nacl,
• nzack,
• nazck,
• nasck,
• nwack,
• nawck,
• nqack,
• naqck,
• naxck,
• nacxk

• nasa,
• naiki,
• NAC,
• Nakia,
• naja,
• nakai,
• nauch,
• nazi,
• naga,
• nakao,
• nagy,
• noack,
• Naos,
• naze,
• nagi,
• nag,
• NAAS,
• nash,
• NASS.

The adjective form of the word "NACK" is "NACKED".

The plural form of the word "NACK" is "NACKS"

The singular form of the word "NACK" is "NACK".