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There are 9 words beginning with OPAC

OPACIFY	• opacify v. (Transitive) To make opaque. • OPACIFY v. to make opaque.
OPACITY	• opacity n. (Uncountable) The state or quality of being opaque, not allowing light to pass through. • opacity n. (Uncountable) The state or quality of being inaccessible to understanding. • opacity n. (Optics, countable) A measure of relative impenetrability to electromagnetic radiation such as light.
OPACOUS	• opacous adj. (Obsolete, chiefly poetic) Not shining or illuminated; dark. • opacous adj. (Obsolete) Not allowing the passage of light; opaque. • OPACOUS adj. (archaic) opaque.
OPACIFIED	• opacified v. Simple past tense and past participle of opacify. • OPACIFY v. to make opaque.
OPACIFIER	• opacifier n. (Chemistry) a chemical agent added to a material, such as rocket propellant, to make it opaque. • opacifier n. (Figuratively) an extraneous agent or vehicle which, intentionally otherwise, makes something opaque. • OPACIFIER n. something that opacifies.
OPACIFIES	• opacifies v. Third-person singular simple present indicative form of opacify. • OPACIFY v. to make opaque.
OPACITIES	• opacities n. Plural of opacity. • OPACITY n. something that is opaque.
OPACIFIERS	• opacifiers n. Plural of opacifier. • OPACIFIER n. something that opacifies.
OPACIFYING	• opacifying v. Present participle of opacify. • OPACIFY v. to make opaque.

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: 24 words
Scrabble in French: 48 words
Scrabble in Spanish: 45 words
Scrabble in Italian: 55 words
Scrabble in German: no word
Scrabble in Romanian: 191 words

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