artlang vs artificial language

artlang and artificial language both are nouns.

Word	Noun	Adjective	Verb	Adverb
artlang	Yes	No	No	No
artificial language	Yes	No	No	No

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

artlang: a constructed language designed for aesthetic pleasure.
artificial language: a language that is deliberately created for a specific purpose

artlang (noun)	artificial language (noun)
a constructed language designed for aesthetic pleasure.	a language that is deliberately created for a specific purpose