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Spectrum:

\spec”trum\, n.; pl. {Spectra}. [L. See {Specter}.]
1. An apparition; a specter. [Obs.]

Chaos:

\cha”os\ (k[=a]“[o^]s), n. [L. chaos chaos (in senses 1 &
2), Gr. cha`os, fr. cha`inein (root cha) to yawn, to gape, to
open widely. Cf. {Chasm}.]
1. An empty, immeasurable space; a yawning chasm. [Archaic]

2. The confused, unorganized condition or mass of matter
before the creation of distinct and orderly forms.