As nouns the difference between spender and spendthrift
is that spender is donor while spendthrift is someone who spends money improvidently or wastefully.
As an adjective spendthrift is
wasteful, improvident or profligate.
spender
English
Noun
(
en noun)
(slang) A person who spends money.
Antonyms
* saver
Derived terms
* last of the big spenders
spendthrift
English
Noun
(
en noun)
Someone who spends money improvidently or wastefully.
Synonyms
* See also
Derived terms
* spendthrift trust
Adjective
(
en adjective)
Wasteful, improvident or profligate.
Lavish or extravagant.