dirty word vs word

dirty word and word both are nouns.

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

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

dirty word (noun)	word (noun)
an offensive or indecent word or phrase	a unit of language that native speakers can identify
a word that is considered to be unmentionable	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

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