slop bowl vs slop basin

slop bowl and slop basin both are nouns.

Word	Noun	Adjective	Verb	Adverb
slop bowl	Yes	No	No	No
slop basin	Yes	No	No	No

As nouns, slop bowl and slop basin are synonyms defined as:

slop bowl and slop basin: a bowl into which the dregs of teacups and coffee cups are emptied at the table

slop bowl (noun)	slop basin (noun)
a bowl into which the dregs of teacups and coffee cups are emptied at the table	a bowl into which the dregs of teacups and coffee cups are emptied at the table