slavery vs thralldom

slavery and thralldom both are nouns.

Word	Noun	Adjective	Verb	Adverb
slavery	Yes	No	No	No
thralldom	Yes	No	No	No

As nouns, slavery and thralldom are synonyms defined as:

slavery and thralldom: the state of being under the control of another person

Other synonyms of slavery include bondage, thraldom, thrall.

slavery (noun)	thralldom (noun)
work done under harsh conditions for little or no pay	the state of being under the control of another person
the practice of owning slaves
the state of being under the control of another person