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There are 14 ten-letter words beginning with COSMO

COSMOCRATS	• cosmocrats n. Plural of cosmocrat. • COSMOCRAT n. a ruler of the world.
COSMODROME	• cosmodrome n. A site for launching spacecraft, usually in reference to such Soviet or Russian built sites as the Baikonur… • COSMODROME n. a launching-site for spacecraft.
COSMOGENIC	• cosmogenic adj. Produced by cosmic rays. • cosmogenic adj. Cosmogenetic. • COSMOGENIC adj. produced by interaction of cosmic rays with earth's surface.
COSMOGONAL	• cosmogonal adj. (Archaic) Of or pertaining to cosmogony. • COSMOGONAL adj. relating to cosmogony, also COSMOGONIC, COSMOGONICAL.
COSMOGONIC	• cosmogonic adj. Of or pertaining to cosmogony. • COSMOGONIC adj. relating to cosmogony, also COSMOGONAL, COSMOGONICAL.
COSMOLATRY	• cosmolatry n. Worship paid to the world. • cosmolatry n. Worship of the cosmos. • COSMOLATRY n. worship of the world.
COSMOLINED	• cosmolined v. Simple past tense and past participle of cosmoline. • COSMOLINE v. to smear with a kind of petroleum jelly as a rust prevention.
COSMOLINES	• cosmolines n. Plural of cosmoline. • cosmolines v. Third-person singular simple present indicative form of cosmoline. • COSMOLINE v. to smear with a kind of petroleum jelly as a rust prevention.
COSMOLOGIC	• cosmologic adj. Synonym of cosmological. • COSMOLOGIC adj. relating to cosmology, also COSMOLOGICAL.
COSMONAUTS	• cosmonauts n. Plural of cosmonaut. • COSMONAUT n. a Russian astronaut.
COSMOPOLIS	• cosmopolis n. An important city, such as a capital city, inhabited by people from a diverse range of cultural backgrounds. • COSMOPOLIS n. a large city.
COSMORAMAS	• cosmoramas n. Plural of cosmorama. • COSMORAMA n. a view of different parts of the world.
COSMORAMIC	• cosmoramic adj. Of or pertaining to a cosmorama. • COSMORAMIC adj. of or pertaining to a cosmorama.
COSMOTRONS	• cosmotrons n. Plural of cosmotron. • COSMOTRON n. a large synchrotron used for accelerating protons to high energies.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 25 words
Scrabble in French: 6 words
Scrabble in Spanish: 10 words
Scrabble in Italian: 15 words
Scrabble in German: no word
Scrabble in Romanian: 22 words

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