left-luggage office vs checkroom

left-luggage office and checkroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
left-luggage office	Yes	No	No	No
checkroom	Yes	No	No	No

As nouns, left-luggage office and checkroom are synonyms defined as:

left-luggage office and checkroom: a room where baggage or parcels are checked

left-luggage office (noun)	checkroom (noun)
a room where baggage or parcels are checked	a room where baggage or parcels are checked