“Millionaire,” even phonetically, but certainly culturally now, seems almost quaint, twee, the miniature version (doesn’t “milli” with the l’s pronounced in a palatal approximant sound almost mouse-like?) of the booming billionaire and exquisite trillionaire.
Perhaps unfortunately, “trillionaire” has insane aura. Extremely slick on the tongue. The word rocks.
Nothing like the mawkish, lumbering “billionaire” with its heavy leading ‘B’ sound.
“Millionaire” was always somewhere in-between. Delightful and cool yet a bit empty. No bite.