telco building vs telecom hotel

telco building and telecom hotel both are nouns.

Word	Noun	Adjective	Verb	Adverb
telco building	Yes	No	No	No
telecom hotel	Yes	No	No	No

As nouns, telco building and telecom hotel are synonyms defined as:

telco building and telecom hotel: a building that houses telecommunications equipment

telco building (noun)	telecom hotel (noun)
a building that houses telecommunications equipment	a building that houses telecommunications equipment