1. Additional; added to supply what is wanted.

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

• supplamental,
• suplemental,
• supplementry,
• supplemantel,
• suplimental,
• suplementas,
• supplemtal,
• supplementy,
• supplimental,
• supplemtental,
• supplemntal,
• supllemental,
• supplemential,
• supplemetnal,
• supplemtnal,
• supplemenatal,
• supplementay,
• suplamental,
• supplementatl,
• supplmental

• supplanting,
• supplementary,
• supplement,
• supplementation,
• suppliant,
• supplanter,
• suppleness.

The adjective form of the word "supplemental" is "supplementary".

The plural of the "supplemental" can be the "supplementals".

The singular of the "supplemental" can be the "supplemental".