• vig bucks,
• nig bucks,
• hig bucks,
• gig bucks,
• bug bucks,
• bjg bucks,
• bkg bucks,
• bog bucks,
• b9g bucks,
• b8g bucks,
• bif bucks,
• biv bucks,
• bib bucks,
• bih bucks,
• biy bucks,
• bit bucks,
• big vucks,
• big nucks,
• big hucks,
• big gucks

The adjective form of the phrase "big bucks" is "big" as an adjective alone.

The plural form of "big bucks" remains the same, as it is already plural.

The singular form of the word "big bucks" is "big buck".