1. Seven and ten.

2. The number seven and ten.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• seveenteen,
• seventten,
• seveteen,
• sevevteen,
• seventen,
• seveneen,
• seventhn,
• seventeeen,
• seventeeno,
• seventyn,
• seventees,
• seventheen,
• seventee,
• seventeed,
• seventhteen,
• sevente,
• sebventeen,
• sevnteen,
• seveneten,
• pesentren

• seventies,
• seventeenth,
• seventhly,
• seventy-one,
• seventy,
• seventieth,
• seventy-two,
• seventy-six,
• seventh,
• seventy-five,
• seventy-nine.

The adjective form of the word "seventeen" is "seventeenth".

The plural form of the word "seventeen" is "seventeens"

The singular form of the word "seventeen" is "seventeen". It does not change in singular form.