Some words with the suffix able include: unable, believable, and imaginable.
agree-ablelove-ableExcite-able
Unknowable is one. UN and ABLE.
Fashionable, capable, canable, suitable, remarkable.
Words like detestable, despicable, and regrettable are examples of negative words that end with the suffix -able.
Some words that have the suffix as morph are:metamorphosisbimorphbimorphemicbimorphsbiomorphicdimorphdimorphicdimorphism
Words with the suffix ance:acceptanceappearancearroganceassistanceclearancecompliancecontinuancedisappearancedistanceeleganceentrancegrievancemaintenanceperformancepredominanceresistancetolerancesubstancetemperanceviligance
Some words that end with the suffix 'fy' are:acidify.amplify.beautify.belfry.calcify.certify.clarify.classify.detoxify.dignify.electrify.emulsify.falsify.fortify.glorify.horrify.identify.intensify.justify.leafy.liquefy.magnify.mystify.notify.nullify.objectify.pacify.purify.qualify.quantify.ratify.rectify.sanctify.solidify.terrify.testify.typify.unify.verify.versify.vilify.vivify.
Some words that end or with suffix cain: cocain. marocain.
-idle isn't a suffix. There are words that end with -idle, like bridle, but it isn't a suffix.
admirableadorableaffordableagreeableavailableavoidablebelievablebendablecalculablecharitableclaimabledetachableexpandableflammableforeseeablelaughablemanageablemeasurablemiserablenotablepalpableportablepunishablereadablerepairablesavablesolvablesuitabletouchabletrainablevaluable
The suffix is "-able" (test is one of the root words). The common words are: contestable detestable incontestable intestable testable uncontestable