sponge bag vs toilet bag

sponge bag and toilet bag both are nouns.

Word	Noun	Adjective	Verb	Adverb
sponge bag	Yes	No	No	No
toilet bag	Yes	No	No	No

As nouns, sponge bag and toilet bag are synonyms defined as:

sponge bag and toilet bag: a waterproof bag for holding bathrooms items (soap and toothpaste etc.) when you are travelling

sponge bag (noun)	toilet bag (noun)
a waterproof bag for holding bathrooms items (soap and toothpaste etc.) when you are travelling	a waterproof bag for holding bathrooms items (soap and toothpaste etc.) when you are travelling