urchin vs tiddler

urchin and tiddler both are nouns.

Word	Noun	Adjective	Verb	Adverb
urchin	Yes	No	No	No
tiddler	Yes	No	No	No

As nouns, tiddler is a hypernym of urchin; that is, tiddler is a word with a broader meaning than urchin:

Other hypernyms of urchin include child, fry, kid, minor, nestling, nipper, shaver, small fry, tike, tyke, youngster.

urchin (noun)	tiddler (noun)
poor and often mischievous city child	a young person of either sex