street urchin vs guttersnipe

street urchin and guttersnipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
street urchin	Yes	No	No	No
guttersnipe	Yes	No	No	No

As nouns, street urchin and guttersnipe are synonyms defined as:

street urchin and guttersnipe: a child who spends most of his time in the streets especially in slum areas

street urchin (noun)	guttersnipe (noun)
a child who spends most of his time in the streets especially in slum areas	a child who spends most of his time in the streets especially in slum areas