pettifogger vs offender

pettifogger and offender both are nouns.

Word	Noun	Adjective	Verb	Adverb
pettifogger	Yes	No	No	No
offender	Yes	No	No	No

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

pettifogger: a person (especially a lawyer or politician) who uses unscrupulous or unethical methods
offender: a person who transgresses moral or civil law

Other hypernyms of pettifogger include wrongdoer.

pettifogger (noun)	offender (noun)
a person (especially a lawyer or politician) who uses unscrupulous or unethical methods	a person who transgresses moral or civil law
a disputant who quibbles; someone who raises annoying petty objections