Iglishmek vs artistic language

Iglishmek and artistic language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Iglishmek	Yes	No	No	No
artistic language	Yes	No	No	No

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

Iglishmek: a constructed language devised by J. R. R. Tolkien, a sign language used by the Dwarves of Middle-Earth.
artistic language: a constructed language designed for aesthetic pleasure.

Other hypernyms of Iglishmek include artlang.

Iglishmek (noun)	artistic language (noun)
a constructed language devised by J. R. R. Tolkien, a sign language used by the Dwarves of Middle-Earth.	a constructed language designed for aesthetic pleasure.