Seiko ER6000 Operation Manual page 26

Words not in Memory
If you press and the word you have entered is
ENTER
not contained in the unit's list of entries, or if the
word you entered is misspelled, the unit will find and
display a word which is spelled most closely to your
entered word.
This happens even if the found word has no
linguistic relationship to your entered word.
Example: internet
24
ENTER
THES
THES
BACK
THES