The Borg Queen wrote:
Does "Geostructure" mean planet though, or is just another word that means something vaguely similar to family/household? Perhaps Mordock & Mendon were cousins.
"Geo-" is a prefix that means "earth." We could quibble that in a world where other habitable planets it's been based more on "soil" or simply "planet" than the literal planet called "Earth." "Structure" of course means a construct.
So "geostructure" could either mean "we're from the same planet" or "we're from the same continent" on the planet. Which would mean that Mendon and Mordock we're of the same "race" of Benzites. (Living on different continents would probably be the same on Benzar as it would be on Earth. Humans who evolved in Europe look different than humans who evolved in Africa; in the latter the harsher sun causing more melanin in the skin to develop producing people with darker skin.)
So, again, (in the show context) Mendon and Mordock only "look alike" because they happen to be from the same area of the same planet.
Kidding aside on calling Wesley a racist for his comment, and it was obviously put there to explain to the audience that this wasn't the same Benzite we saw earlier (though there's no reason people would make such a connection given the context of his visiting and being told he has a different name), it's pretty... "Unprofessional" to go up to an alien and assume he's someone of the same race you know from a year ago when a)you were just told his name
and b)just told
he was visiting on an exchange program and not an officer!