18 letters · 31 points in Scrabble
originEtymology tree Proto-Indo-European *speḱ- Proto-Indo-European *-yeti Proto-Indo-European *spéḱyeti Proto-Italic *spekjō Latin speciō Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Italic *-trom Latin -trum Latin spectrumbor. English spectrum English spectro- English photometric English spectrophotometric From spectro- + photometric.
Etymology from Wiktionary, CC BY-SA 3.0