accumulative
addable
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additional
bilinear
complemental
complementary
completing
cumulative
extra
incremental
intercalary
summational
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supplemental
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accession
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accompaniment
addenda
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additament
addition
additory
additum
adjunct
adjuvant
annex
annexation
appanage
appendage
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appurtenance
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attachment
augment
augmentation
chain
coda
complement
component
concomitant
constituent
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corollary
elemental
extension
extrapolation
fixture
increase
increment
offshoot
pendant
positive
reinforcement
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side issue
supplement
tailpiece
undergirding
adhesive
by-product
catalyst
chemical
cleaner
contaminant
detergent
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fertilizer
formulations
hydrocarbon
lubricant
pesticide
polymer
reagents
residue
solvent
surfactants
toxin
vapors
vitamin
subtractive