Well, a lot of em, for various reasons. Some just sound stupid, don't fit right, or just cause confusion.
Feel free to add your own.
Empire, Empire Space, The 5 Empires - There is only one Empire, and the other 4 shouldn't be too keen to casually call themselves this. It's also confusing to the new folks, who must think that only Amarr space is +5.0sec...
Alternatives - Concord Space, Enforced Space, The 'Inner Sphere' (or something equivalent)
POS - I know they're not supposed to be officially called this (towers are supposed to be called Starbases), but as soon as POS became the nickname (the term wasn't some kind of cutesy compliment, CCP...) they just let it stick. News releases and stuff are guilty too, shoehorning the term to mean 'pilot-owned-starbases', which is wrong too, since many of our missions show the towers in use by every group under the stars, egg or no, and usually with much cooler looking attachments....
Alternatives - Starbase, Space Tower (no.), something....tower-y?
Gallentean/Caldarian - We all know it's supposed to be THE GALLENTE PEOPLE and THE CALDARI PEOPLE, but somehow even though we all mocked the shit out of TonyG for it, these terrible words have slowly spread into the rest of the lore, into the chrons, and now even into RPer vocabularies like some sort of rabid space syphilis. Fuck that noise.
Alternatives - Use of these godawful terms is an automatic 50DKPMINUS.
MERCS - We've got to head this one off at the pass quick. With the release of DUST getting closer and closer, the designated term to address these new supersoldiers is commonly being seen as 'mercs'. Even the overview stuff leaking into our EVE builds marks DUST stuff as 'Merc Stuff'. Nien! That term means a lot in a universe where more than half of all armed force in existence is already for sale. This will get especially misleading when DUST players attach themselves permanently to Alliances and factions. They're not for hire at that point, they are the actual army of a group.
Alternatives - Dusters? Is that too clunky? (Oh god, here come the DUSTERS....snerk) Something else?
Finally, the big one, and the one I feel strongest about by far.
Us.
CAPSULEERSI have cringed every time I've heard this term in the history of ever, this supposedly terrifying name of the dark demigods that roam the viscous and bloody oceans of the skies oh my god what a dorky name I bet they're in the chess club.
Even CCP didn't like it, as the first years of lore barely touched the term, instead referring to the players only as 'pilots', which apparently (and correctly) was eventually judged to not have enough Oomph. They needed something else, and 8 years in we still need that something else.
Worse still, the term does not even refer to the group it is meant for, IE player characters.
There is currently no 'lore term' for a player character, especially when capsuleers serve as NPCs all over the place. Every 'empire' (argh) has hundreds of them in their employ directly and on a short leash. Every rat you fight in a mission that's flying a T2 variant? Guess what! NPC in an egg. It was one of the things in Empyrean Age that Tony got dead on. Roden sure isn't a player character either....
There needs to be a new term, something that differentiates a mere guy in an egg from the independent, monitored by CONCORD, able to form into near-sovereign recognized nations as a group type of pilots that truly taint the dreams of people like Omir, Kosakami, Sarpati, and Kuvakei.
Alternatives - The Unbound? That's the only one I've come up with so far...
Anyways, those are mine, how about yours?