suppliment

Suppliment is often a misspelling of supplement.

Suppliment has no English definition.

As a noun supplement

is something added, especially to make up for a deficiency.

As a verb supplement

is to provide or make a supplement to something.

As a verb substitute is

to use in place of something else, with the same function.

As a noun substitute is

a replacement or stand-in for something that achieves a similar result or purpose.