Czech vs Slavic

Czech and Slavic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Czech	Yes	Yes	No	No
Slavic	Yes	Yes	No	No

As nouns, Slavic is a hypernym of Czech; that is, Slavic is a word with a broader meaning than Czech:

Other hypernyms of Czech include Slavic language, Slavonic, Slavonic language.

Czech (noun)	Slavic (noun)
the Slavic language of Czechs	a branch of the Indo-European family of languages
a native or inhabitant of the former republic of Czechoslovakia
a native of inhabitant of the Czech Republic

Czech (adjective)	Slavic (adjective)
of or relating to Czechoslovakia or its people or their language	of or relating to Slavic languages