The term 'no longer valid' can be expressed in a variety of ways. The crossword solutions for this term are 'exploded' (8 letters), 'NULL' (4 letters), 'VOID' (4 letters), 'EXPIRED' (7 letters), and 'nullandvoid' (11 letters). 'Exploded' implies that something has been destroyed or broken apart, while 'NULL' and 'VOID' both refer to something that is legally invalid or nonexistent. 'EXPIRED' suggests that something has reached its end date or has become outdated. Finally, 'nullandvoid' combines the two words to emphasize that something is completely invalid.