Big money has 3 different meanings across 1 category:
Noun
Noun
1
a large sum of money (especially as pay or profit)
"she made a bundle selling real estate"
"they sank megabucks into their new house"
2
A large amount of money, especially a significant source of revenue or income.
Adjective
1
Involving or transacting a large amount of money.
Broader Terms (hypernyms)