abyss vs abysm

abyss and abysm both are nouns.

Word	Noun	Adjective	Verb	Adverb
abyss	Yes	No	No	No
abysm	Yes	No	No	No

As nouns, abyss and abysm are synonyms defined as:

abyss and abysm: a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)

abyss (noun)	abysm (noun)
a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)	a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)