| 100% | SITONIT | 7 | “Happy Days” retort |
| 82% | GOODTIMES | 9 | Happy days |
| 80% | RALPHMALPH | 10 | Happy Days jokester |
| 76% | FONZ | 4 | Happy Days Arthur's nickname |
| 75% | YAY | 3 | "Oh, happy day!" |
| 74% | CHACHI | 6 | Baio on Happy Days |
| 74% | GOSPELMUSIC | 11 | "Oh Happy Day" genre |
| 73% | RON | 3 | Happy Days star Howard who directs movies |
| 72% | ERINMORAN | 9 | Played Joanie on Happy Days |
| 71% | MORGAN | 6 | Kojak and Happy Days actress, __ Fairchild |
| 70% | HALCYON | 7 | Happy, as bygone days |
| 70% | PAYDAY | 6 | Board game, candy bar, happy day |
| 69% | FONZIE | 6 | Henry Winkler's nickname in Happy Days |
| 69% | FONZIE | 6 | Arthur Herbert's nickname from Happy Days |
| 69% | RICHIE | 6 | Ron Howard's character in Happy Days |
| 69% | BECKETT | 7 | Samuel, playwright of Endgame and Happy Days |
| 69% | ANSON | 5 | Williams who played Potsie on Happy Days |
| 69% | BAIO | 4 | Scott who played Chachi in Happy Days |
| 69% | ARNOLDS | 7 | Name of the diner in Happy Days |
| 68% | FRI | 3 | Happy hour day, usually: Abbr. |
| 67% | OUR | 3 | "The Happiest Days of ___ Lives," by Pink Floyd |
| 66% | MAR | 3 | I Want You to be Happy Day mo. |
| 66% | MANY | 4 | ___ happy returns of the day |
| 66% | MANY | 4 | "___ happy returns of the day!" |
| 66% | MANY | 4 | ___ happy returns of the day! |
| 65% | SUZI | 4 | Singer Quatro who played Leather Tuscadero on Happy Days |
| 63% | SOS | 3 | "Mamma Mia!" song that begins "Where are those happy days?" |
| 62% | MANY | 4 | "___ happy returns of the day" (lots of) |
| 62% | HENRYWINKLER | 12 | Actor who starred as Fonzie in US television sitcom Happy Days |
| 60% | SUZIQUATRO | 10 | Singer-actress who played Leather Tuscadero in US television sitcom Happy Days |