The term SUFFIX WITH DUCT can be broken down into two parts: a suffix and the word 'DUCT'. A suffix is a word part that is added to the end of a root word to change its meaning. The two crossword solutions for this term are ULE (3 letters) and ILE (3 letters). ULE is a suffix derived from the Latin word -ulus, which means small or little. ILE is a suffix derived from the Latin word -ilis, which means pertaining to or capable of. Both ULE and ILE can be added to the word 'DUCT' to form new words such as 'CONDUIT' and 'AQUEDUCT'.