triclinium vs dining room

triclinium and dining room both are nouns.

Word	Noun	Adjective	Verb	Adverb
triclinium	Yes	No	No	No
dining room	Yes	No	No	No

As nouns, dining room is a hypernym of triclinium; that is, dining room is a word with a broader meaning than triclinium:

triclinium: a dining room (especially a dining room containing a dining table with couches along three sides)
dining room: a room used for dining

Other hypernyms of triclinium include dining-room.

triclinium (noun)	dining room (noun)
a dining table with couches along three sides in ancient Rome	a room used for dining
a dining room (especially a dining room containing a dining table with couches along three sides)