Bergen-Belsen concentration camp vs Belsen

Bergen-Belsen concentration camp and Belsen both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bergen-Belsen concentration camp	Yes	No	No	No
Belsen	Yes	No	No	No

As nouns, Bergen-Belsen concentration camp and Belsen are synonyms defined as:

Bergen-Belsen concentration camp and Belsen: a Nazi concentration camp for Jews created in northwestern Germany during World War II

Bergen-Belsen concentration camp (noun)	Belsen (noun)
a Nazi concentration camp for Jews created in northwestern Germany during World War II	a Nazi concentration camp for Jews created in northwestern Germany during World War II