Synonyms of add on

Noun

1. addition, add-on, improver, component, constituent, element

usage: a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"

2. accessory, appurtenance, supplement, add-on, component, constituent, element

usage: a supplementary component that improves capability

Verb

1. add on, add

usage: make an addition; "Let's add on to this"

2. append, add on, supplement, affix, attach

usage: add to the very end; "He appended a glossary to his novel where he used an invented language"