Saami vs Lappish

Saami and Lappish both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saami	Yes	No	No	No
Lappish	Yes	No	No	No

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

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

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

Saami (noun)	Lappish (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