words vs pettifoggery

words and pettifoggery both are nouns.

Word	Noun	Adjective	Verb	Adverb
words	Yes	No	No	No
pettifoggery	Yes	No	No	No

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

Other hyponyms of words include affray, altercation, fracas, bicker, bickering, fuss, spat, squabble, tiff, bust-up.

words (noun)	pettifoggery (noun)
words making up the dialogue of a play	a quarrel about petty points
an angry dispute
the text of a popular song or musical-comedy number
the words that are spoken
language that is spoken or written