A word that only recently came into existence is new, but so is a word with which you were previously unfamiliar.
For instance, archaic words. Once they were known, but their groove was lost.
I love lists like this. So many wonderful potential names for a Northeastern IPA are herein.
These words are no longer in everyday use or have lost a particular meaning in current usage but are sometimes used to impart an old-fashioned flavour to historical novels, for example, or in standard conversation or writing just for a humorous effect. Some, such as bedlam, reveal the origin of their current meaning, while others reveal the origin of a different modern word, as with gentle, the sense of which is preserved in gentleman. Some, such as learn and let, now mean the opposite of their former use.
Following are 12 archaic words, with dozens and dozens more at the web site. Lovers of vintage literature probably will recognize more than a few.
bibliopole … a dealer in books
caducity … the infirmity of old age; senility
cicisbeo … a married woman’s male companion or lover
dandiprat … a young or insignificant person
embouchure … the mouth of a river
gudgeon … a credulous person
jakes … an outdoor toilet
kickshaw … a fancy but insubstantial cooked dish
peregrinate … travel or wander from place to place
quidnunc … an inquisitive, gossipy person
scaramouch … a boastful but cowardly person
yclept … by the name of