"supplement" in the noun sense

1. addendum, supplement, postscript

textual matter that is added onto a publication usually at the end

2. supplement, supplementation

a quantity added (e.g. to make up for a deficiency)

3. accessory, appurtenance, supplement, add-on

a supplementary component that improves capability

"supplement" in the verb sense

1. supplement

add as a supplement to what seems insufficient

"supplement your diet"

2. supplement

serve as a supplement to

"Vitamins supplemented his meager diet"

3. append, add on, supplement, affix

add to the very end

"He appended a glossary to his novel where he used an invented language"

Source: WordNet® (An amazing lexical database of English)

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