scruple vs qualm

scruple and qualm both are nouns.

Word	Noun	Adjective	Verb	Adverb
scruple	Yes	No	Yes	No
qualm	Yes	No	No	No

As nouns, scruple and qualm are synonyms defined as:

scruple and qualm: uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety)

Other synonyms of scruple include misgiving.

scruple (noun)	qualm (noun)
an ethical or moral principle that inhibits action	uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety)
uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety)	a mild state of nausea
a unit of apothecary weight equal to 20 grains