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spectator one that watches or observes. [2 definitions]
specter a ghost or apparition, esp. one that causes dread or terror. [2 definitions]
spectra a pl. of spectrum.
spectral of, pertaining to, or like a specter. [2 definitions]
spectro- spectrum.
spectrogram a graphic representation or photograph of a spectrum.
spectrograph a spectroscope equipped to make a photograph or graphic representation of a spectrum.
spectroheliograph a device that is used to make photographs of the sun, using a single light from the spectrum, such as violet.
spectrometer a spectroscope equipped to measure wavelengths and the positions and angles of lines in a spectrum.
spectroscope an optical instrument that enables examination, measurement, or recording of a spectrum by rendering its component electromagnetic waves, as of light or radiation, distinct and visible.
spectrum an array of a physical system or phenomenon according to the magnitude of one of its properties such as mass or wavelength, esp. an array of light in the order of wavelengths that produces the rainbow. [2 definitions]
speculate to make guesses or wonder about something (often fol. by on, about, or the like). [3 definitions]
speculation the act or process of thinking, wondering, or guessing about something. [4 definitions]
speculative of, pertaining to, or based on conjecture or theorizing. [4 definitions]
speculator one that engages in financial speculations. [2 definitions]
speculum a medical instrument that can be opened after insertion, used to dilate a passage or cavity so that it can be examined. [3 definitions]
sped a past tense and past participle of speed.
speech the faculty of communicating by speaking, or the act of speaking. [7 definitions]
speech clinic a facility where people with speech defects are treated.
speechify to make a speech, esp. one that is too long or too obviously a harangue.
speechless unable to speak because of exhaustion, surprise, astonishment, or great emotion. [2 definitions]