Parasitic is a term used to describe organisms that live off of other organisms for their survival. The two crossword solutions, LEECHLIKE (9 letters) and BLOODSUCKING (12 letters), are both accurate descriptions of parasitic behavior. LEECHLIKE refers to the physical characteristics of some parasites, such as leeches, which have a slimy, segmented body and suck blood from their hosts. BLOODSUCKING is a more general term that describes the behavior of many parasites, which feed on the blood of their hosts.