- spectral logging
- spectral luminance
- spectral method
- spectral occupancy
- spectral pitch
- spectral pyranometer
- spectral radiance
- spectral radius
- spectral range
- spectral reflectance
- spectral response
- spectral responsivity
- spectral sensitivity
- spectral sequence
- spectral series
- spectral shape
- spectral signature
- spectral space
- spectral splitting
- spectral term
- spectral transmittance
- spectral width
- spectral window
- spectrality
- spectrally
- spectre
- spectro
- spectro graph
- spectroboscopic method
- spectrochemical log
- spectrochemistry
- spectrocomparator
- spectrogram
- spectrograph
- spectrographic
- spectrographic analysis
- spectrography
- spectroheliogram
- spectroheliograph
- spectroheliography
- spectrohelioscope
- spectrology
- spectrometer
- spectrometric
- spectrometric analysis
- spectrometric method
- spectrometry
- spectrophotography
- spectrophotometer
- spectrophotometric
- spectrophotometry
- spectropolarimeter
- spectroprojector
- spectroradiometer
- spectroscope
- spectroscopic
- spectroscopic binary
- spectroscopic lamp
- spectroscopic method
- spectroscopic parallax
- spectroscopic technique
- spectroscopy
- spectrum
- spectrum allocation
- spectrum amplitude
- spectrum analysis
- spectrum analyzer
- spectrum broadening
- spectrum component
- spectrum compression
- spectrum congestion
- spectrum display
- spectrum distribution
- spectrum division
- spectrum economy
- spectrum efficiency
- spectrum level
- spectrum line
- spectrum management
- spectrum metrics
- spectrum occupancy
- spectrum recorder
- spectrum selectivity
- spectrum sensitivity
- spectrum sharing
- spectrum signature
- spectrum utilization
- spectrum width
- specula
- specular
- specular coal
- specular iron
- specular reflection
- specular reflector
- specular surface
- speculate
- speculation
- speculation buyer
- speculation fever
- speculation pressure