language vs orthoepy

language and orthoepy both are nouns.

Word	Noun	Adjective	Verb	Adverb
language	Yes	No	No	No
orthoepy	Yes	No	No	No

As nouns, orthoepy is a hyponym of language; that is, orthoepy is a word with a more specific, narrower meaning than language:

language (noun)	orthoepy (noun)
the mental faculty or power of vocal communication	a term formerly used for the part of phonology that dealt with the `correct' pronunciation of words and its relation to `correct' orthography
the cognitive processes involved in producing and understanding linguistic communication	the way a word or a language is customarily spoken
a systematic means of communicating by the use of sounds or conventional symbols
(language) communication by word of mouth
the text of a popular song or musical-comedy number
a system of words used to name things in a particular discipline