2 syllables:
-phonic, blahnik, chronic, chronik, chronique, chthonic, clonic, conac, conic, connick, cronach, cronic, dhanak, hanak, john hick, konak, koneke, konik, kronick, kronik, monic, nonic, onych, onych-, phonic, sonic, stronach, swan-neck, swanneck, taanach, tonic, tronic, vanik, yonic

3 syllables:
5g-tronic, achronic, adonic, ammonic, aphonic, arconic, atonic, azonic, baryonic, benthonic, biconic, bionic, boronic, bosonic, boytronic, brittonic, brythonic, bubonic, byronic, canonic, carbanak, cinchonic, cistronic, cratonic, croconic, crotonic, cyclonic, daimonic, demonic, dextronic, draconic, dysgonic, dysphonic, dystonic, ebonic, entonic, eugonic, euphonic, eutonic, exonic, fibronic, flextronic, geartronic, gluconic, glyconic, gnathonic, gnomonic, hadronic, harmonic, hedonic, hydronic, iconic, illfonic, intronic, ionic, ioniq, ironic, jetronic, ketonic, laconic, lactonic, lapponic, lasonic, leptonic, leuconic, malonic, maltonic, masonic, meconic, medtronic, mesonic, metonic, miltonic, mnemonic, mneumonic, moronic, motronic, muconic, myronic, nektonic, nemonic, neumonic, neuronic, neustonic, nimonic, nirvanic, obconic, opsonic, ovonic, oxonic, ozonic, paeonic, paiwanic, peptonic, personic, phosphonic, photonic, photronic, phytonic, pionic, pixonic, planktonic, plantronic, plasmonic, platonic, pleustonic, plutonic, pneumonic, posttonic, pretonic, protonic, psaphonic, psionic, pulmonic, pyrrhonic, santonic, sardonic, saronic, sasanach, sclavonic, scorponok, silk sonic, siphonic, spintronic, stratonic, subsonic, subtonic, sulfonic, sulphonic, symphonic, synchronic, syntonic, taconic, tartronic, tectonic, teutonic, thionic, tiptronic, tithonic, tiyanak, totonac, transonic, transsonic, tranzonic, tritonic, tychonic, typhonic, umbonic, vibronic, viewsonic, zoonic

4 syllables:
acetonic, acrophonic, aeroponic, aleuronic, algedonic, allochronic, allophonic, amnionic, amphictyonic, amphigonic, anachronic, anemonic, anharmonic, anhedonic, aniconic, anionic, antimonic, antiphonic, antitonic, autochthonic, auxotonic, avionic, biotronik, cacophonic, calcedonic, cataphonic, catatonic, catatonique, cationic, chalcedonic, chelidonic, chiromonic, chorionic, citraconic, cosmogonic, diachronic, diaphonic, diasonic, diatonic, dicarbonic, disharmonic, dithionic, duophonic, electronic, eletronic, embryonic, endergonic, enharmonic, environic, epigonic, epitonic, ethionic, eudemonic, euharmonic, exergonic, exosonic, fermionic, first harmonic, gallionic, ganglionic, geogonic, geoponic, gin and tonic, glottogonic, glutaconic, haematonic, hegemonic, histionic, histrionic, homophonic, hooverphonic, housatonic, hydroponic, hypersonic, hypertonic, hypotonic, infrasonic, inharmonic, intertonic, isochronic, isogonic, isotonic, itaconic, katatonic, kopaonik, lasersonic, lexiphonic, m4sonic, macaronic, mastodonic, mechatronic, megaphonic, melophonic, mesaconic, methionic, microphonic, monaxonic, monochronic, monophonic, monotonic, multitronic, myelonic, myoclonic, myotonic, nekrotronic, nepionic, neurotonic, nonharmonic, nonionic, normotonic, nucleonic, panasonic, panteutonic, paraconic, paratonic, pentatonic, pharaonic, philharmonic, photophonic, phototonic, plate-tectonic, podstakannik, polyconic, polyphonic, positronic, propionic, psychotronic, quadraphonic, quadrasonic, quadriphonic, quadrisonic, quadrophonic, respironic, rhodizonic, saccharonic, saxophonic, schizogonic, semisonic, semitonic, spheroconic, sporogonic, stentoronic, stetsasonic, subharmonic, supersonic, supertonic, tachyonic, talionic, technetronic, technotronic, telectronic, telephonic, telharmonic, teraconic, theogonic, thermionic, tonic-clonic, trithionic, ultrasonic, unironic, uvitonic, vagotonic, valvetronic, varitronic, vasotonic, vibrionic, xeronic, xylophonic

5 syllables:
abembryonic, actinophonic, aganglionic, angiotonic, animatronic, aniseikonic, anisotonic, anti-masonic, antibubonic, antimnemonic, arachidonic, architectonic, audiotronic, balto-slavonic, boustrophedonic, cacodaemonic, cardiotonic, cerebrotonic, chameleonic, dodecaphonic, ego-dystonic, ego-syntonic, egodystonic, egosyntonic, electrotonic, eudaemonic, extraembryonic, geotectonic, heterogonic, hyaluronic, hydrocarbonic, interionic, isethionic, isokeraunic, mediatonic, metantimonic, monocarbonic, monocistronic, napoleonic, neo-platonic, neoplatonic, nonmonotonic, noropianic, oenothionic, olympionic, opisthotonic, orthocarbonic, pathognomonic, pentathionic, peristeronic, phanerocodonic, phytoplanktonic, polycistronic, postganglionic, pre-embryonic, preganglionic, proto-ionic, proto-japonic, pyroantimonic, radiophonic, stentorophonic, stereophonic, sulphantimonic, sulphocarbonic, tetrathionic, uterotonic, viscerotonic, zooplanktonic, zwitterionic

6 syllables:
adelocodonic, bioelectronic, catelectrotonic, hyperisotonic, interganglionic, intraembryonic, isoelectronic, microelectronic, monochorionic, optoelectronic, periganglionic, photoelectronic, physiognommonic, polyembryonic, thanatognomonic, vasohypertonic

7 syllables:
an evening with silk sonic, cacodemonic, cytoarchitectonic, radiotelephonic

8 syllables:
audio-animatronic