There is a total of 13249 clues beginning with pi
- Pioneer in 45 singles
- Pioneer in aircraft
- Pioneer in alternating current
- Pioneer in American publishing
- Pioneer in animal conservation
- Pioneer in antisepsis
- Pioneer in arcade games
- Pioneer in astronomy, c 1530
- Pioneer in atomic theory
- Pioneer in automobile industry
- Pioneer in automobiles
- Pioneer in autos
- Pioneer in aviation
- Pioneer in Birth Control
- Pioneer in calculus
- Pioneer in calculus notation
- Pioneer in canned soft drinks
- Pioneer in car safety
- Pioneer in close-up magic
- Pioneer in color TV
- Pioneer in color TV broadcasting
- Pioneer in commercial spaceflight
- Pioneer in computer chess
- Pioneer in conditioning research
- Pioneer in cool jazz
- Pioneer in Cubism
- Pioneer in Dadaism
- Pioneer in development of celluloid
- Pioneer in digital recording
- Pioneer in early cars
- Pioneer in electrical science
- Pioneer in electrical science (1745–1827)
- Pioneer in electricity
- Pioneer in electricity
- Pioneer in electrodynamics
- Pioneer in electrodynamics
- Pioneer in elevators
- Pioneer in email
- Pioneer in experimental science
- Pioneer in extrasensory perception
- Pioneer in fluid mechanics
- Pioneer in global aviation
- Pioneer in graph theory
- Pioneer in heliocentric theory
- Pioneer in high-tension electricity
- Pioneer in hydrostatics
- Pioneer in hypnotism
- Pioneer in IM'ing
- Pioneer in IQ testing
- Pioneer in IQ testing
- Pioneer in Impressionism
- Pioneer in indoor refrigeration
- Pioneer in instant messaging
- Pioneer in late-night TV
- Pioneer in literary realism
- Pioneer in mass-production methods
- Pioneer in mathematical logic
- Pioneer in medicine
- Pioneer in movie-making
- Pioneer in New Criticism
- Pioneer in New Journalism in the 1960s-'70s
- Pioneer in number theory
- Pioneer in photocopying
- Pioneer in photography
- Pioneer in physics, c 250 BC
- Pioneer in pistol-grip hair dryers
- Pioneer in portable music
- Pioneer in probability
- Pioneer in psychedelics
- Pioneer in psychiatry
- Pioneer in psychoanalysis
- Pioneer in public education
- Pioneer in public health
- Pioneer in pure mathematics
- Pioneer in quadraphonic music
- Pioneer in quadraphonic records
- Pioneer in quantum theory
- Pioneer in radiation detection
- Pioneer in scholasticism
- Pioneer in self-driving cars
- Pioneer in selling by mail
- Pioneer in sewing machines
- Pioneer in show recording
- Pioneer in side-scrolling video games
- Pioneer in smooth jazz
- Pioneer in social work
- Pioneer in socialism
- Pioneer in space
- Pioneer in steam engines
- Pioneer in stream-of-consciousness narration
- Pioneer in Surrealism
- Pioneer in syllogistic logic
- Pioneer in systematic botany, c 1750
- Pioneer in the development of nuclear power
- Pioneer in the fashion world
- Pioneer in the field of exobiology
- Pioneer in the math of sudoku
- Pioneer in the Nevada gaming industry
- Pioneer in the occult
- Pioneer in the study of supersonic velocities