"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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