2 syllables:
geysers, guisers, kaiser's, kaisers, misers, pfizer's, risers, sizers, visors

3 syllables:
adviser's, advisers, advisers', advisors, chastisers, despisers, devisers, devisors, divisors, franchisers, franchisors, incisors, quantizers, revisers

4 syllables:
advertiser's, advertisers, advertisers', aggrandizers, analysers, analyzers, appetisers, appetizers, atomisers, atomizers, breathalysers, breathalyzers, civilizers, colonisers, colonizers, compromisers, criticisers, criticizers, digitizers, energizers, enterprisers, equalizers, exercisers, fertilisers, fertilizers, galvanisers, harmonisers, harmonizers, idolisers, idolizers, immunisers, improvisers, ionisers, ionizers, itemizers, liquidizers, maximizers, memorizers, merchandisers, mesmerizers, minimizers, mobilizers, modernizers, moisturisers, moisturizers, moralizers, nebulisers, nebulizers, neutralizers, optimizers, organizers, oxidisers, oxidizers, patronizers, plagiarizers, plasticizers, polarizers, pulverisers, pulverizers, realisers, recognisers, recognizers, rittereiser's, sanitizers, scrutinizers, sensitisers, sensitizers, sermonizers, stabilisers, stabilizers, sterilisers, sterilizers, subsidisers, subsidizers, supervisor's, supervisors, supervisors', sympathisers, sympathizers, synchronizers, synthesisers, synthesizers, tantalizers, temporizers, tenderizers, terrorizers, totalizers, tranquilizers, tranquillizers, utilizers, vaporisers, vaporizers, vocalisers, womanisers, womanizers

5 syllables:
demagnetizers, deodorisers, deodorizers, economizers, homogenisers, homogenizers, hypothesizers, immobilizers, metabolizers, philosophizers, popularisers, proselytisers, proselytizers, rationalizers, systematizers

6 syllables:
gyrostabilizers, photosensitizers

10 syllables:
council of economic advisors