• unlegal,
• bonlegal,
• monlegal,
• jonlegal,
• honlegal,
• ninlegal,
• nknlegal,
• nlnlegal,
• npnlegal,
• nonlegl,
• nonleagl,
• nonlegall,
• nonlegel,
• non legal,
• nonlexial,
• non-legel,
• nonlygal,
• non-leagal,
• nonelegal,
• nonneglal

• nonlexical.

The adjective form of "nonlegal" is "illegal".

The plural form of "nonlegal" remains the same, as it is an adjective and does not change when used in plural context.

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