Lapp vs Lappish language

Lapp and Lappish language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lapp	Yes	No	No	No
Lappish language	Yes	No	No	No

As nouns, Lappish language is a hypernym of Lapp; that is, Lappish language is a word with a broader meaning than Lapp:

Lapp: the language of nomadic Lapps in northern Scandinavia and the Kola Peninsula
Lappish language: any of the languages spoken by the Lapps and generally assumed to be Uralic languages

Other hypernyms of Lapp include Lappic, Lappic language, Lappish.

Lapp (noun)	Lappish language (noun)
the language of nomadic Lapps in northern Scandinavia and the Kola Peninsula	any of the languages spoken by the Lapps and generally assumed to be Uralic languages
a member of an indigenous nomadic people living in northern Scandinavia and herding reindeer