worth vs pennyworth

worth and pennyworth both are nouns.

Word	Noun	Adjective	Verb	Adverb
worth	Yes	Yes	No	No
pennyworth	Yes	No	No	No

As nouns, pennyworth is a hyponym of worth; that is, pennyworth is a word with a more specific, narrower meaning than worth:

Other hyponyms of worth include ha'p'orth, halfpennyworth, penn'orth.

worth (noun)	pennyworth (noun)
the quality that renders something desirable or valuable or useful	the amount that can be bought for a penny
an indefinite quantity of something having a specified value

worth (adjective)	pennyworth (adjective)
having a specified value
(often used ironically) worthy of being treated in a particular way