changeling vs tiddler

changeling and tiddler both are nouns.

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

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

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

changeling (noun)	tiddler (noun)
a child secretly exchanged for another in infancy	a young person of either sex
a person of subnormal intelligence