The term 'missing link' is used to describe a hypothetical connection between two different things, often in the context of evolution. The crossword solutions for this term include 'OMISSION' (8 letters), 'GAP' (3 letters), 'HIATUS' (6 letters), 'OAF' (3 letters), 'BRUTE' (5 letters), 'APEMAN' (6 letters), 'prehuman' (8 letters), 'protohuman' (10 letters), 'brokenthread' (12 letters), and 'lostconnection' (14 letters). All of these words refer to a lack of connection or continuity between two things, which is what the term 'missing link' implies.