[Buddha-l] Spelling Question

[Hal Cooper]

Obviously I am challenged when it comes to spelling.  I am wondering if both
these spellings are correct, or  is one more correct than the other?  I have
seen it spelled both ways in different books.

Anuttara-samyak-sambodhi
Anatura-samyak-sambodhi

Definition-  Supreme, unexcelled, perfect and equal enlightenment. The
perfect wisdom which comprehends truth that is attained only by a Buddha, in
contrast to the different grades of enlightenment attained by Bodhisattvas
and Arahants.