bawdy vs dirty word

bawdy and dirty word both are nouns.

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

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

Other hypernyms of bawdy include filth, obscenity, smut, vulgarism.

bawdy (noun)	dirty word (noun)
lewd or obscene talk or writing	an offensive or indecent word or phrase
	a word that is considered to be unmentionable

bawdy (adjective)	dirty word (adjective)
humorously vulgar