As adjectives the difference between temporaneous and extra
is that temporaneous
is (obsolete) temporary while extra
is beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
As an adverb extra is
(informal) to an extraordinary degree.
As a noun extra is
(cricket) a run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in australia referred to as a sundry.
As a noun terms
As an adjective temporaneous is