scruples vs small voice

scruples and small voice both are nouns.

Word	Noun	Adjective	Verb	Adverb
scruples	Yes	No	No	No
small voice	Yes	No	No	No

As nouns, small voice is a hyponym of scruples; that is, small voice is a word with a more specific, narrower meaning than scruples:

scruples: motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions
small voice: an inner voice that judges your behavior

Other hyponyms of scruples include superego, voice of conscience, wee small voice, sense of duty, sense of shame.

scruples (noun)	small voice (noun)
motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions	an inner voice that judges your behavior