diachronic vs language

diachronic is not a noun while language is a noun.

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

diachronic (noun)	language (noun)
	the mental faculty or power of vocal communication
	the cognitive processes involved in producing and understanding linguistic communication
	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

diachronic (adjective)	language (adjective)
used of the study of a phenomenon (especially language) as it changes through time