er ▁terms ▁are ▁known ▁to ▁gain ▁new , ▁sometimes ▁contradict ory , ▁mean ings ▁( e . g ., ▁e pon ym ▁and ▁crypt onym ). ▁In ▁many ▁cases , ▁two ▁or ▁more ▁words ▁describe ▁the ▁same ▁phenomen on , ▁but ▁no ▁preced ence ▁is ▁disc ern ible ▁( e . g ., ▁ne c ron ym ▁and ▁p enth onym ). ▁New ▁words ▁are ▁sometimes ▁created , ▁the ▁meaning ▁of ▁which ▁dup lic ating ▁existing ▁terms . ▁On ▁occasion , ▁new ▁words ▁are ▁formed ▁with ▁little ▁regard ▁to ▁historical ▁principles . ▁ ▁W ords ▁that ▁end ▁in ▁- onym ▁▁ ▁ac ron ym : ▁considered ▁to ▁be ▁a ▁" word " ▁in ▁its ▁original ▁sense ▁formed ▁from ▁the ▁initial s ▁of ▁one ▁or ▁more ▁words ▁that ▁is ▁pron ounce able ▁like ▁a ▁normal ▁word , ▁such ▁as ▁NAT O , ▁sometimes ▁in ▁distinction ▁to ▁initial ism ; ▁reflect ing ▁a ▁historical ▁development ▁from ▁its ▁component ▁word ▁initial s ▁ ▁all onym : ▁an ▁author ' s ▁name ▁of ▁another ▁person ' s , ▁often ▁a ▁well - known ▁person ' s , ▁name ; ▁an ▁alternative ▁term ▁for ▁a ▁pseud onym ▁ ▁an ac ron ym : ▁an ▁ac ron ym ▁so ▁well - est ab lished ▁that ▁its ▁origin ▁as ▁an ▁abbre viation ▁is ▁no ▁longer ▁widely ▁known ▁and ▁its ▁component ▁initial s ▁are ▁in ▁danger ▁of ▁no ▁longer ▁being ▁recognized ▁( a ▁bl end ▁of ▁an ach ron ism ▁and ▁ac ron ym ) ▁ ▁and ron ym : ▁a