discussion vs word

discussion and word both are nouns.

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

As nouns, discussion and word are synonyms defined as:

Other synonyms of discussion include give-and-take.

discussion (noun)	word (noun)
an exchange of views on some topic	a unit of language that native speakers can identify
an extended communication (often interactive) dealing with some particular topic	a promise
	information about recent and important events
	a brief statement
	an exchange of views on some topic
	a secret word or phrase known only to a restricted group
	a verbal command for action
	a string of bits stored in computer memory

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