ninja/ʹninjə/ noun (pl ninja ninjas)

• specif.
• specific
• specification
• specific charge
• specific gravity
• specific heat capacity
• specific performance
• specify
• specimen
• specious
• speck
• speckle
• specs
• spectacle
• spectacled
• spectacles
• spectacular
• spectate
• spectator
• specter
• spectra
• spectral
• spectre
• spectro-
• spectrogram