spending money vs pocket money

spending money and pocket money both are nouns.

Word	Noun	Adjective	Verb	Adverb
spending money	Yes	No	No	No
pocket money	Yes	No	No	No

As nouns, spending money and pocket money are synonyms defined as:

spending money and pocket money: cash for day-to-day spending on incidental expenses

Other synonyms of spending money include pin money.

spending money (noun)	pocket money (noun)
cash for day-to-day spending on incidental expenses	cash for day-to-day spending on incidental expenses