Autocompletion is a related term of autocomplete.
In context|computing|lang=en terms the difference between autocompletion and autocomplete
is that
autocompletion is (computing) a software feature permitting form fields, etc, to be autocompleted while
autocomplete is (computing) to complete automatically.
As a noun autocompletion
is (computing) a software feature permitting form fields, etc, to be autocompleted.
As a verb autocomplete is
(computing) to complete automatically.