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No. Xe is not a valid Scrabble word.
Some nouns that start with EX are:examinationexampleexceptionexcerptexchangeexcisionexcitementexzcemaexitexcellenceexerciseexplanationexperimentexplorerexplorationexhibitexhibitionistextraexclamationexcursionexecutionexecutiveexecutorexobiologyexogamyexoskeletonexpenseexpirationexponentexportexposureexposéexpressionextensionextentexteriorextrapolationexplanation
Some Scrabble words that start with U are:upususeunderuncleurineuntoundounclearunnecessaryumbrellaurgentuglyusefulumberutilityunusualunguentuniversalupperundulyundecidedutmostunitunmanageable
Xenon (Xe)
No - The only valid two letter words using X in scrabble (interestingly you can create them with each of the vowels) are: AX EX XI OX XU
Words starting with USHUsherUsheranceUsherancesUsherdomUsherdomsUsheredUsheressesUsheretteUsherettesUsheringUsheringsUsherlessUsherredUsherringUshersUshershipUsherships
Axe.
avenue??
effecteffigyefforteffuse
knowledge
There are no words that start with ZH, here are some words that start with z:ZacatonZaddickZaffarsZaffersZaffirsZaffresZaggingZaikaisZamarraZamarroZananasZandersZaniestZanyishZapateoZappersZappierZappingZaptiahZaptiehZarebasZareebaZaribasZealotsZealousZeatinsZebecksZebraicZebranoZebrassZebrineZebroidZecchinZechinsZedoaryZelkovaZemstvaZemstvoZenaidaZenanasZenithsZeoliteZephyrsZeppoleZeppoliZeroingZestersZestfulZestierZestilyZestingZeugmasZibethsZiggingZigzagsZikuratZilchesZillahsZillionZincateZincifyZincingZinciteZinckedZincoidZincousZinganiZinganoZingaraZingareZingariZingaroZingersZingierZingingZinkifyZinniasZiplessZiplockZippersZippierZippingZirconsZithernZithersZizzledZizzlesZlotiesZlotychZoarialZoariumZocalosZodiacsZoeciumZoisiteZombiesZombifyZonallyZonatedZonkingZonulaeZonularZonulasZonulesZooeciaZoogenyZoogleaZooidalZooiestZoologyZoomingZooningZootierZootomyZorillaZorilleZorilloZostersZouavesZoysiasZydecosZygomasZygosesZygosisZygotesZygoticZymasesZymogenZymosanZymosesZymosisZymoticZymurgyZyzzyva