Meaning : No longer in existence. Lost or especially having died out leaving no living representatives.
Example :
An extinct species of fish.
An extinct royal family.
Extinct laws and customs.
Synonyms : extinct
Still in existence. Not extinct or destroyed or lost.
Extant manuscripts.Meaning : No longer existing or inaccessible through loss or destruction.
Example :
Its nonextant original was written on vellum.
Nonextant meaning in Bengali (Bangla).