West (Bundesrepublik Deutschland) and East (Deutsche Demokratische Republik)
Germanys.
Solar energy and sunlight are the two names given to the sun's energy.
What polygon? Your asking "what are two names to describe a polygon" but haven't given a polygon...
Chocolate cake
Bactrian camel, two humps. Dromedary, one hump.
odyse
Whatever names they were given at birth.....
The two names given to a species are its genus name and its specific epithet, which together form its scientific name or binomial name.
Germany. Faced war on two frontires
nuclear fusion
Binomial Nomenclature