A 720 light freighter is utilized as a shell by a massive dekamite queen.
A queen was a female whose eggs led to the development of an entire colony, as seen in certain insectoid species. The lyleks of Ryloth are one such example. Likewise, the term "queen" was used to describe large female krayt dragons found on Tatooine.
In the case of the sentient Geonosians, the queen of a hive could also function as the political leader, governing her people. However, in certain hives, the queen's role was limited to producing offspring, while the ruling was done by the aristocratic caste.
The Colicoids, who are also sentient, are similar to the Geonosians in that they also possess queens.