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There are 7 seven-letter words containing PERA

OPERANDoperand n. (Mathematics, computing) A quantity to which an operator is applied (in 3−𝑥, the operands of the subtraction…
OPERAND n. a quantity on which a mathematical or logical operation is (to be) performed.
OPERANToperant adj. That operates to produce an effect.
operant n. An operative person or thing.
operant n. (Psychology) Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.
OPERATEoperate v. (Transitive or intransitive) To perform a work or labour; to exert power or strength, physical or mechanical; to act.
operate v. (Transitive or intransitive) To produce an appropriate physical effect; to issue in the result designed…
operate v. (Transitive or intransitive) To act or produce effect on the mind; to exert moral power or influence.
PERACIDperacid n. (Chemistry) Any acid that contains a peroxy group - e.g. peracetic acid.
peracid n. (Inorganic chemistry) The oxyacid of a particular element that has the largest number of oxygen atoms…
PERACID n. a type of acid.
PERAEONperaeon n. Alternative form of pereion.
PERAEON n. (Greek) a crustacean's thorax, also PEREION, PEREON.
POPERASpoperas n. Plural of popera.
POPERA n. operatic music presented to gain popular appeal.
TEMPERAtempera n. A medium used to bind pigments in painting, as well as the associated artistic techniques.
tempera n. (Countable) A painting done in this medium.
TEMPERA n. (Italian) an emulsion, esp. made with egg yolk, used as a medium for powdering pigments.

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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