Word Parts - duo, du

One of the fastest ways to increase your vocabulary is by learning word parts, i.e., roots, prefixes, suffixes or forms.

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duo-, du- : From Latin two

sesquiduplicate - having the ratio of two and a half to one, or of five to two; dubious - fraught with uncertainty or doubt; undecided; duplex - channel capable of transmitting data in both directions at the same time; duomachy - fight between two in single combat.

And for you:

indubitably; dualize; duet; dual; dualism; dulogue; dualpurpose; redouble.

Source: English-Word Information, Word Info About English Vocabulary