What are the best answers for “a supplementary component that improves capability”?

accessory, appurtenance, supplement.

How many letters does the top answer for “a supplementary component that improves capability” have?

The most common answer is accessory (9 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

accessory 9 letters wn-def

a supplementary component that improves capability

appurtenance 12 letters wn-def

a supplementary component that improves capability

supplement 10 letters wn-def

add as a supplement to what seems insufficient