| Pioneer of projectile physics | 29 |
| Pioneer of New Journalism | 25 |
| Pioneer of late-night talk shows | 32 |
| Pioneer of detective fiction | 28 |
| Pioneer of Dadaism | 18 |
| Pioneer of cool jazz | 20 |
| Pioneer of art's Neue Sachlichkeit movement | 47 |
| Pioneer of antiseptic surgery | 29 |
| Pioneer of ambient music Brian | 30 |
| Pioneer name in video games | 27 |
| Pioneer movie director | 22 |
| Pioneer missionary in California | 32 |
| Pioneer item | 12 |
| Pioneer in wireless telegraphy | 30 |
| Pioneer in vaccination | 22 |
| Pioneer in U.S. cotton industry | 31 |
| Pioneer in the occult | 21 |
| Pioneer in the Nevada gaming industry | 37 |
| Pioneer in the math of sudoku | 29 |
| Pioneer in the manufacture of steel plows | 41 |
| Pioneer in the development of nuclear power | 43 |
| Pioneer in synthesizers | 23 |
| Pioneer in surrealism | 21 |
| Pioneer in smooth jazz | 22 |
| Pioneer in side-scrolling video games | 37 |
| Pioneer in scholasticism | 24 |
| Pioneer in quantum theory | 25 |
| Pioneer in quadraphonic records | 31 |
| Pioneer in quadraphonic music | 29 |
| Pioneer in psychoanalysis | 25 |
| Pioneer in probability | 22 |
| Pioneer in pistol-grip hair dryers | 34 |
| Pioneer in number theory | 24 |
| Pioneer in New Criticism | 24 |
| Pioneer in medicine | 19 |
| Pioneer in mathematical logic | 29 |
| Pioneer in mass-production methods | 34 |
| Pioneer in literary realism | 27 |
| Pioneer in late-night TV | 24 |
| Pioneer in instant messaging | 28 |
| Pioneer in I.Q. testing | 23 |
| Pioneer in Hollywood | 20 |
| Pioneer in high-tension electricity | 35 |
| Pioneer in fluid mechanics | 26 |
| Pioneer in electrodynamics | 26 |
| Pioneer in electricity | 22 |
| Pioneer in electrical science | 29 |
| Pioneer in development of celluloid | 35 |
| Pioneer in Dadaism | 18 |
| Pioneer in Cubism | 17 |
| Pioneer in cool jazz | 20 |
| Pioneer in conditioning research | 32 |
| Pioneer in calculus notation | 28 |
| Pioneer in calculus | 19 |
| Pioneer in bacteriology | 23 |
| Pioneer in animal conservation | 30 |
| Pioneer in alternating current | 30 |
| Pioneer in 35mm cameras | 23 |
| Pioneer in 33 1/3 r.p.m. records | 32 |
| Pioneer home | 12 |
| Pioneer heroine Betty | 21 |
| Pioneer heading | 15 |
| Pioneer guitar producer Paul | 28 |
| Pioneer gp. | 11 |
| Pioneer German automaker | 24 |
| Pioneer geneticist Gregor | 25 |
| Pioneer geneticist | 18 |
| Pioneer gardener? | 17 |
| Pioneer fur trader | 18 |
| Pioneer fort | 12 |
| Pioneer film producer: 1864-1948 | 32 |
| Pioneer film maker | 18 |
| Pioneer family's conveyance | 31 |
| Pioneer Expressionist James | 27 |
| Pioneer dwelling | 16 |
| Pioneer Day state | 17 |
| Pioneer Day month, in Utah | 26 |
| Pioneer Day celebrants | 22 |
| Pioneer Day celebrant | 21 |
| Pioneer Daniel | 14 |
| Pioneer computer of 1946 | 24 |
| Pioneer computer | 16 |
| Pioneer company, since 1972, in computer reservations | 53 |
| Pioneer cell phone co. | 22 |
| Pioneer Carson | 14 |
| Pioneer carriers | 16 |
| Pioneer carrier | 15 |
| Pioneer building material | 25 |
| Pioneer brand of craft beer | 27 |
| Pioneer botanist Franz ___ | 26 |
| Pioneer bop vibist Jackson | 26 |
| Pioneer Boone, for short | 24 |
| Pioneer Boone, folksily | 23 |
| Pioneer Boone, familiarly | 25 |
| Pioneer Boone, briefly | 22 |
| Pioneer Boone's nickname | 28 |
| Pioneer bathyspherist William | 29 |
| Pioneer bathyspherist | 21 |
| Pioneer automaker | 17 |
| Pioneer auto manufacturer | 25 |