See perceivable in Webster's New World Roget's A-Z Thesaurus II
adjective
Capable of being seen:
discernible, perceptible, seeable, viewable, visible, visual. See seeCapable of being noticed or apprehended mentally:
appreciable, detectable, discernible, distinguishable, noticeable, observable, palpable, perceptible, ponderable, sensible. See knowledge
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