Subtly_strange, I believe 'displaced nomad' is a custom user rank, one that GreenTea has chosen for herself because she has over 1,000 posts. After that point, you can just edit it to your own pleasure.
The custom ranks on WP are as follows:
0-8: Emu Egg
9-17: Butterfly
18- 24: Hummingbird
25-49 :Tufted Titmouse
50-74 : Yellow-bellied woodpecker
75-99: Blue Jay
100-124 :Raven
125-174: Snowy Owl
175-199: Pileated woodpecker
200-249 : Sea Gull
250-299- :Toucan
300-499: Deinonychus
400-599: Velociraptor
500-999: Phoenix
1000 onward, your own custom rank.
As for definitions, from the top of my dome, I'm quite familiar with Deinonychus and Velociraptor, two genera of dromaeosaurids, predatory dinosaurs with sickle-shaped claws on their feet. It's interesting that WP has chosen to make Velociraptor the higher rank than Deinonychus, as Velociraptor is the smaller genus of the two, only about 6 feet in length. Deinonychus is almost twice as large. It's speculated both hunted in packs, but considering that in modern times, a single genus like Panthera (lions, tigers, panthers, and jaguars) includes species that are solitary hunters as well as species that live and hunt in social groups, we may assume that the different species within the respective genera Deinonychus and Velociraptor had distinctive lifestyles.
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clarity of thought before rashness of action