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additional

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suppletive

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adjunctive

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complemental

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adjunct

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ancillary

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auxiliary

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accessary

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adjuvant

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unsupplemented

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accessorial

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extra

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accessory

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complementary

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supernumerary

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additive

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secondary

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superadditive

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superfluous

adj 0.584

extry

adj 0.576

extracurricular

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extraneous

adj 0.570

subsidiary

adj 0.565

nonessential

adj 0.564

top-up

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adjutant

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supervenient

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supporting

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surplus

adj 0.546

suffixal

adj 0.542

surrogate

adj 0.541

excipient

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augmented

adj 0.535

ampliative

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unessential

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augmentative

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plus

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assistant

adj 0.528

extra-label

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subsequent

adj 0.526

superscript

adj 0.526

optional

adj 0.524

contributory

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superabundant

adj 0.523

supernatural

adj 0.522

extramental

adj 0.521

subordinate

adj 0.520

further

adj 0.519

other

adj 0.519

superimposed

adj 0.518

suppositional

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adjoint

adj 0.517

supranormal

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corollary

adj 0.515

accretive

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alternative

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incidental

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corroborative

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excess

adj 0.512

adjectival

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supererogatory

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supernatant

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inessential

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extrinsic

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sup

adj 0.509

subtractive

adj 0.509

value added

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super

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supervisory

adj 0.506

extended

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deluxe

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subscript

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superscripted

adj 0.504

superior

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supraoptimal

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compensatory

adj 0.503

ad lib

adj 0.503

supportive

adj 0.500