tot vs youngster

tot and youngster both are nouns.

Word	Noun	Adjective	Verb	Adverb
tot	Yes	No	Yes	No
youngster	Yes	No	No	No

As nouns, youngster is a hypernym of tot; that is, youngster is a word with a broader meaning than tot:

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

tot (noun)	youngster (noun)
a young child who is just beginning to walk	a young person of either sex
a small amount (especially of a drink)

tot (verb)	youngster (verb)
determine the sum of