language vs word

language and word both are nouns.

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

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

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

language (noun)	word (noun)
the mental faculty or power of vocal communication	a unit of language that native speakers can identify
the cognitive processes involved in producing and understanding linguistic communication	a promise
a systematic means of communicating by the use of sounds or conventional symbols	information about recent and important events
(language) communication by word of mouth	a brief statement
the text of a popular song or musical-comedy number	an exchange of views on some topic
a system of words used to name things in a particular discipline	a secret word or phrase known only to a restricted group
	a verbal command for action
	a string of bits stored in computer memory

language (verb)	word (verb)
	put into words or an expression