Nouns

(n)synthetic, synthetic substancea compound made artificially by chemical reactions

Adjectives

(s)man-made, semisynthetic, syntheticnot of natural origin; prepared or made artificially“man-made fibers”, “synthetic leather”
(a)synthetic, syntheticalinvolving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis“limnology is essentially a synthetic science composed of elements … that extend well beyond the limits of biology” (P.S.Welch)
(a)syntheticsystematic combining of root and modifying elements into single words
(a)synthetic, syntheticalof a proposition whose truth value is determined by observation or facts“‘all men are arrogant’ is a synthetic proposition”
(s)celluloid, syntheticartificial as if portrayed in a film“a novel with flat celluloid characters”
(s)syntheticnot genuine or natural“counterfeit rhetoric that flourishes when passions are synthetic” (George Will)