The crossword solution for the term 'PUZZLE COMPLETION' is MENT, which is a four-letter word. MENT is a suffix that is added to the end of a word to indicate a state or action. For example, the word 'MENTOR' is derived from the suffix 'ment' and means someone who provides guidance and support. The suffix 'ment' is also used to form nouns such as 'ENJOYMENT' and 'DEVELOPMENT'. In conclusion, the crossword solution for the term 'PUZZLE COMPLETION' is MENT, a four-letter suffix used to form nouns and indicate states or actions.