upsilon /ūp-sīˈlon, ŭp-, ūpˈsi- or upˈsi-/ or ypsilon /ip-sīˈlon or ipˈsi-/

1. The twentieth letter of the Greek alphabet (Υ, υ)
2. As a numeral υˈ = 400, ˌυ = 400000
3. A short-lived heavy subatomic particle produced when beryllium nuclei are bombarded with high-energy protons

• hunt-the-gowking
• hunt-the-gowks
• hunt the letter
• hunt-the-slipper
• hunt up
• Huon pine
• hup
• hupaithric
• huppah
• huppahs
• hupped
• hupping
• hups
• hurcheon
• hurden
• hurdens
• hurdies
• hurdle
• hurdled
• hurdler
• hurdle-race
• hurdle-racer
• hurdle-racers
• hurdle-races
• hurdle-racing