word vs lexicalize

word is a noun but lexicalize is not a noun.

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

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

word: put into words or an expression
lexicalize: make or coin into a word or accept a new word into the lexicon of a language

Other hyponyms of word include ask, lexicalise, dogmatise, dogmatize, formularise, formularize, cast, couch, frame, put, redact.

word (noun)	lexicalize (noun)
a unit of language that native speakers can identify
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

word (verb)	lexicalize (verb)
put into words or an expression	make or coin into a word or accept a new word into the lexicon of a language