slop pail vs slop jar

slop pail and slop jar both are nouns.

Word	Noun	Adjective	Verb	Adverb
slop pail	Yes	No	No	No
slop jar	Yes	No	No	No

As nouns, slop pail and slop jar are synonyms defined as:

slop pail and slop jar: a large pail used to receive waste water from a washbasin or chamber pot

slop pail (noun)	slop jar (noun)
a large pail used to receive waste water from a washbasin or chamber pot	a large pail used to receive waste water from a washbasin or chamber pot