Just to get some flavour, the following jingles are among those possible to register @ ncy.me:

• aberrancy me
• abeyancy me
• absorbancy me
• absorbency me
• accountancy me
• adamancy me
• adjacency me
• adjutancy me
• advertency me
• affluency me
• agency me
• appetency me
• ardency me
• ascendancy me
• ascendency me
• astringency me
• attractancy me
• belligerency me
• benignancy me
• blatancy me
• bouncy me
• brilliancy me
• buoyancy me
• cadency me
• captaincy me
• chancy me
• chaplaincy me
• chatoyancy me
• chieftaincy me
• chiromancy me
• clemency me
• coagency me
• codependency me
• cogency me
• coherency me
• competency me
• complacency me
• compliancy me
• concurrency me
• congruency me
• conservancy me
• consistency me
• consonancy me
• constancy me
• constituency me
• consultancy me
• contingency me
• conveniency me
• convergency me
• conversancy me
• corpulency me
• correspondency me
• counterinsurgency me
• countertendency me
• covalency me
• currency me
• decadency me
• decency me
• deficiency me
• delinquency me
• dependency me
• despondency me
• detergency me
• deviancy me
• dilatancy me
• discordancy me
• discrepancy me
• divergency me
• dormancy me
• ebulliency me
• efficiency me
• elegancy me
• emergency me
• eminency me
• ensigncy me
• equivalency me
• errancy me
• excellency me
• excrescency me
• exigency me
• expectancy me
• expediency me
• extravagancy me
• exultancy me
• fancy me
• fervency me
• flagrancy me
• flamboyancy me
• flatulency me
• flippancy me
• flouncy me
• fluency me
• fragrancy me
• frequency me
• geomancy me
• gyrofrequency me
• hesitancy me
• hydromancy me
• immanency me
• imminency me
• immunodeficiency me
• impermanency me
• impertinency me
• importancy me
• impotency me
• inadvertency me
• incessancy me
• incipiency me
• inclemency me
• incompetency me
• inconsistency me
• inconstancy me
• incontinency me
• inconveniency me
• incumbency me
• indecency me
• independency me
• indifferency me
• inefficiency me
• inerrancy me
• inexpediency me
• infancy me
• infrequency me
• inhabitancy me
• innocency me
• insignificancy me
• insistency me
• insolvency me
• instancy me
• insufficiency me
• insurgency me
• interagency me
• interdependency me
• intermittency me
• irrelevancy me
• itinerancy me
• jouncy me
• lambency me
• latency me
• leniency me
• lieutenancy me
• lucency me
• malignancy me
• mendicancy me
• militancy me
• mincy me
• mordancy me
• multiagency me
• multicurrency me
• multifrequency me
• nancy me
• nascency me
• necromancy me
• nonbelligerency me
• nonemergency me
• nonfluency me
• nonresidency me
• occupancy me
• oneiromancy me
• opulency me
• patency me
• peccancy me
• pendency me
• permanency me
• persistency me
• pertinency me
• petulancy me
• piquancy me
• plangency me
• pliancy me
• poignancy me
• postemergency me
• postulancy me
• potency me
• precedency me
• precipitancy me
• predominancy me
• pregnancy me
• preoccupancy me
• preponderancy me
• prepotency me
• presidency me
• proficiency me
• pruriency me
• pseudopregnancy me
• pudency me
• pungency me
• pyromancy me
• radiancy me
• radiolucency me
• rampancy me
• recalcitrancy me
• recency me
• recumbency me
• recusancy me
• redundancy me
• regency me
• regnancy me
• relevancy me
• reluctancy me
• renitency me
• repellency me
• repugnancy me
• residency me
• resiliency me
• resplendency me
• reticency me
• rhabdomancy me
• saliency me
• sapiency me
• sequency me
• sergeancy me
• significancy me
• solvency me
• stagnancy me
• stridency me
• stringency me
• subagency me
• subjacency me
• subpotency me
• subserviency me
• subtenancy me
• sufficiency me
• superagency me
• superefficiency me
• superintendency me
• sycophancy me
• tangency me
• tenancy me
• tendency me
• totipotency me
• transcendency me
• transiency me
• translucency me
• transparency me
• trenchancy me
• truancy me
• truculency me
• turbulency me
• turgency me
• unbouncy me
• unchancy me
• unfancy me
• unsoncy me
• urgency me
• vacancy me
• vagrancy me
• valency me
• valiancy me
• verdancy me
• vibrancy me
• vicegerency me
• virulency me
• zincy me

N.B. corresponding emails @ncy.me will work too.

In fact, only your imagination is the limit.