prodigal vs spendthrift

prodigal and spendthrift both are nouns.

Word	Noun	Adjective	Verb	Adverb
prodigal	Yes	Yes	No	No
spendthrift	Yes	Yes	No	No

As adjectives, prodigal and spendthrift are synonyms defined as:

Other synonyms of prodigal include extravagant, profligate.

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

Other hyponyms of prodigal include scattergood, spend-all, spender, waster, wastrel.

prodigal (noun)	spendthrift (noun)
a recklessly extravagant consumer	someone who spends money prodigally

prodigal (adjective)	spendthrift (adjective)
recklessly wasteful	recklessly wasteful