supplement
//ˈsʌpləmənt//
Noun
Something added to complete a thing, make up for a deficiency, or extend or strengthen the whole.
The textbook comes with an online supplement that includes practice exercises.
A dietary product containing vitamins, minerals, or other nutritional substances taken to enhance health or nutrition.
She takes vitamin supplements every morning to stay healthy.
An additional section or part added to a book, document, or newspaper to provide further information.
The newspaper published a special supplement on environmental issues.
Synonym
Verb
To add something to (something else) in order to complete, extend, or strengthen it.
She supplements her income by working part-time on weekends.
To provide an addition to something, especially to make up for a deficiency.
She supplements her income by working part-time on weekends.