t-scope vs tachistoscope

t-scope and tachistoscope both are nouns.

Word	Noun	Adjective	Verb	Adverb
t-scope	Yes	No	No	No
tachistoscope	Yes	No	No	No

As nouns, t-scope and tachistoscope are synonyms defined as:

t-scope and tachistoscope: scientific instrument used by psychologists; presents visual stimuli for brief exposures

t-scope (noun)	tachistoscope (noun)
scientific instrument used by psychologists; presents visual stimuli for brief exposures	scientific instrument used by psychologists; presents visual stimuli for brief exposures