Open English Wordnet
Nouns
(n)doublea stand-in for movie stars to perform dangerous stunts“his first job in Hollywood was as a double for Clark Gable” (n)double, image, look-alikesomeone who closely resembles a famous person (especially an actor)“he could be Gingrich's double”,
“she's the very image of her mother” (n)doublea quantity that is twice as great as another“36 is the double of 18” (n)doubling, doubleraising the stakes in a card game by a factor of 2“I decided his double was a bluff” Verbs
(v)double, duplicateincrease twofold“The population doubled within 50 years” (v)doubledo double duty; serve two purposes or have two functions“She doubles as his wife and secretary” (v)doublemake a demand for (a card or suit) Adjectives
(s)double, dual, twofold, two-fold, treble, threefold, three-foldhaving more than one decidedly dissimilar aspects or qualities“a double (or dual) role for an actor”,
“the office of a clergyman is twofold; public preaching and private influence” (R.W.Emerson),
“every episode has its double and treble meaning” (Frederick Harrison) (s)double, dual, dupleconsisting of or involving two parts or components usually in pairs“an egg with a double yolk”,
“a double (binary) star”,
“double doors”,
“dual controls for pilot and copilot”,
“duple (or double) time consists of two (or a multiple of two) beats to a measure” (a)doubleused of flowers having more than the usual number of petals in crowded or overlapping arrangements“double chrysanthemums have many rows of petals and are usually spherical or hemispherical” (a)bivalent, doubleused of homologous chromosomes associated in pairs in synapsis (s)doublelarge enough for two“a double bed”,
“a double room” (s)double, forkedhaving two meanings with intent to deceive“a sly double meaning”,
“spoke with forked tongue” Adverbs
(r)doubledownward and forward“he was bent double with pain” (r)doubletwo together“some people sleep better double” (r)doubly, double, twiceto double the degree“she was doubly rewarded”,
“his eyes were double bright” 