I always just call it an ATM, I've never heard ATM machine
Although if you were talking, one could think you are saying "pin" and not "pen" so ink would clarify. But I think most people would be able to use context clues to figure out the right thing lolInk pen? Well doesn't the pen already come with the ink anyway?
I remember on a school field trip ages ago, the Georgia Aquarium said to use "fish" when referring to a single fish, or several of a single fish species, but to use "fishes" when referring to fish of different species. I always thought that was kinda dumb though, so I just say "fish" for everything.Had an existential crisis the other day about the use of "fish" versus "fishes".
German Shepherd Dog ... official name ... as though we didn't know it was a dog.