MEDLINE vs telephone system

MEDLINE and telephone system both are nouns.

Word	Noun	Adjective	Verb	Adverb
MEDLINE	Yes	No	No	No
telephone system	Yes	No	No	No

As nouns, telephone system is a hypernym of MEDLINE; that is, telephone system is a word with a broader meaning than MEDLINE:

MEDLINE: the computer-based telephone system of the United States National Library of Medicine that provides rapid linkage to MEDLARS
telephone system: a communication system that transmits sound between distant points

Other hypernyms of MEDLINE include phone system.

MEDLINE (noun)	telephone system (noun)
the computer-based telephone system of the United States National Library of Medicine that provides rapid linkage to MEDLARS	a communication system that transmits sound between distant points