• walka,
• tacco,
• wakon,
• zacky,
• aiko,
• jacko,
• wamo,
• wackly,
• waho,
• walkk,
• wack,
• weack,
• wacth,
• wockn,
• wicki,
• waske,
• backuo,
• acco,
• wackey,
• wecks

• wake,
• Wac,
• wasko,
• whacko,
• waco,
• wax,
• wacky,
• wag.

The adjective form of the word "wacko" is "wacky".

The plural form of "wacko" is "wackos"

The singular form of the word "wacko" is "wacko". The word does not have a distinct singular form, as it is a slang term used to describe someone who is eccentric or mentally unstable.