syllabary vs Devanagari

syllabary and Devanagari both are nouns.

Word	Noun	Adjective	Verb	Adverb
syllabary	Yes	No	No	No
Devanagari	Yes	No	No	No

As nouns, Devanagari is a hyponym of syllabary; that is, Devanagari is a word with a more specific, narrower meaning than syllabary:

Other hyponyms of syllabary include Devanagari script, Nagari, Nagari script.

syllabary (noun)	Devanagari (noun)
a writing system whose characters represent syllables	a syllabic script used in writing Sanskrit and Hindi