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There are 12 words ending with OPTER

ADOPTER	• adopter n. One who adopts. • ADOPTER n. one who adopts.
CHIROPTER	• chiropter n. A member of the order Chiroptera, a bat. • CHIROPTER n. a type of bat.
COLEOPTER	• coleopter n. (Zoology) One of the Coleoptera. • COLEOPTER n. an aircraft that has an annular wing with the fuselage and engine on the centre line.
COPTER	• copter n. (Informal) A helicopter. • copter v. (Informal, transitive) To helicopter: to transport by helicopter. • copter v. (Informal, intransitive) To helicopter: to travel by helicopter.
DIOPTER	• diopter n. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters… • diopter n. The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder. • diopter n. (Photography, dated) A lens element attached to the front of a photographic lens to shorten the lens’s…
GYROCOPTER	• gyrocopter n. (Aviation) An autogyro, similar to a helicopter. • GYROCOPTER n. an airplane balanced and supported by the aerodynamic forces acting on rapidly rotating horizontal or slightly inclined airfoils, also GYROPLANE.
HELICOPTER	• helicopter n. (Aviation) An aircraft that is borne along by one or more sets of long rotating blades which allow it… • helicopter n. A powered troweling machine with spinning blades used to spread concrete. • helicopter n. (Botany) The winged fruit of certain trees, such as ash, elm, and maple.
HOROPTER	• horopter n. For any system of binocular vision, a three-dimensional curve containing all points from which the light… • HOROPTER n. a set of points which have the same visual angle.
OPTER	• opter n. One who opts, or makes a choice. • OPTER n. someone who opts.
ORNITHOPTER	• ornithopter n. An aircraft that generates lift through the flapping of its wings. • ORNITHOPTER n. a birdlike archaic flying machine.
ORTHOPTER	• orthopter n. Any insect of the order Orthoptera. • orthopter n. Synonym of ornithopter. • ORTHOPTER n. a type of aircraft propelled with flapping wings.
QUADCOPTER	• quadcopter n. A rotorcraft propelled by four rotors. • QUADCOPTER n. a pilotless four-rotor helicopter.

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: 45 words
Scrabble in French: 3 words
Scrabble in Spanish: 1 word
Scrabble in Italian: no word
Scrabble in German: 2 words
Scrabble in Romanian: 20 words

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