waif vs tiddler

waif and tiddler both are nouns.

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

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

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

waif (noun)	tiddler (noun)
a homeless child especially one forsaken or orphaned	a young person of either sex