| alternate(noun, adjective, cover, substitute, joint) |
| duple(adjective, part, pair, twin, burlesqued) |
| increase(verb, action, advance, raise, boost) |
| paired(adjective, like, quantity, similar, identical) |
| twice(adjective, adverb, pair, dual, two) |
| two(noun, adjective, quantity, duplication, accompaniment) |
| understudy(noun, cover, reserve, substitute, replacement) |
| doubled |
| redouble(verb, advance, increase, raise, rise) |
| ringer(noun, reproduction, slang, report, figure) |
| twice as much(expression, idiom, quantity) |
| binary(noun, adjective, part, like, identical) |
| reduplicate(verb, copy, counterfeit, imitate, reproduce) |
| repeat(verb, increase, swell, copy, grow) |
| crease(noun, verb, order, smooth, bend) |
| ditto(noun, verb, form, reproduction, study) |
| duplicated(adjective, quantity, pair, burlesqued, dual) |
| equal(noun, verb, adjective, close, like) |
| geminate(verb, adjective, part, increase, like) |
| likeness(noun, form, reproduction, study, agreement) |