Is there a post somewhere that explains the etiquette on f.ds? I have played Codenames like twice so I know the basic idea, but I don't necessarily remember what kind of stuff was considered acceptable or whether there's variations depending on the group.
We are still kind of in the process of figuring it out. In VIII we've done open discussion between the guessers and locked in answers in bold. You can read a sample of that game to get an idea if it helps.
For leech tick, water, disease*, slug/scorpion come to mind. Tick for also being a parasitic creature that sucks blood, water for being the general habitat for leeches, disease for cupping therapy used to cure whatever in times of the yore, slug/scorpion for being animals like leech is. Feel free to lock in whatever you feel is strongest when you log on unless you feel we need to discuss more.
*Desease is probably a misspelling of disease?