An especially common source of confusion is evident when speaking of houseplants also, where a rose by any other name might be very different than another.
I try to make it a habit to learn the scientific names of my fish (mostly silver tetras) and my houseplants (mostly green ones with leaves). Having said that I hope there isn't a pop quiz, but if I ever need help, I'm thinking the guy I really need to talk to probably knows the latin name - it's almost a test of qualification

If I tell you a jack is a fish that we could go fishing for (round here), and you caught one, tell me would you put your fingers in his mouth to grab the hook?
If I tell you we're going to boat an Esox lucius, would you reconsider?
FOR THOSE INTERESTED IN METRIC CONVERSION: If you run XP (please don't flame me) you can d/l a free upgrade to the standard Windows calculator from here that does on the fly metric conversions and lots of other cool things besides, it's actually, um, useful

http://www.microsoft.com/windowsxp/pro/ ... ertoys.asp
Sorry for the long post