The verb oppugn (oppugns, oppugning, oppugned) is used the same as its synonyms, "oppose," "question," "dispute," "challenge," or "disagree with." Example sentences:

His book was one of the first critical works to oppugn modernism.

I do not wish to oppugn the character by bearing false witness in regard to her activities.

He had the audacity to oppugn the director's decisions.

She was punished for being stupid enough to oppugn the conclusions of the head of the company.

He publicly oppugned the views in the book when he gave his speech.

Some words that have the root word "pugn" in them are pugnacious, impugn, repugnant, and oppugn.

Here's 44. You can pick the six you like:

align

antiforeign

arraign

assign

benign

campaign

champaign

codesign

coign

condign

consign

coreign

cosign

countercampaign

countersign

deign

deraign

design

eloign

ensign

feign

foreign

impregn

impugn

indign

malign

misalign

misassign

oppugn

outdesign

overdesign

preassign

realign

reassign

reconsign

redesign

reign

repugn

resign

sign

sovereign

thegn

unbenign

undersign

attune baboon balloon bassoon bestrewn boon buffoon cartoon cocoon commune coon croon doubloon dragoon dune festoon forenoon goon harpoon hewn immune impugn jejune june lagoon lampoon loon lune maroon mistune monsoon moon neptune noon oppugn platoon poltroon pontoon prune quadroon raccoon racoon rangoon roughhewn rune saloon shogun soon spittoon spoon strewn swoon teaspoon tribune triune tune tycoon typhoon walloon attune baboon balloon bassoon bestrewn boon buffoon cartoon cocoon commune coon croon doubloon dragoon dune festoon forenoon goon harpoon hewn immune impugn jejune june lagoon lampoon loon lune maroon mistune monsoon moon neptune noon oppugn platoon poltroon pontoon prune quadroon raccoon racoon rangoon roughhewn rune saloon shogun soon spittoon spoon strewn swoon teaspoon tribune triune tune tycoon typhoon walloon

align

antiforeign

arraign

assign

benign

campaign

champaign

codesign

coign

condign

consign

coreign

cosign

countercampaign

countersign

deign

deraign

design

eloign

ensign

feign

foreign

impregn

impugn

indign

malign

misalign

oppugn

outdesign

overdesign

preassign

realign

reassign

redesign

reign

repugn

resign

sign

sovereign

thegn

unbenign