tachistoscope vs t-scope

tachistoscope and t-scope both are nouns.

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

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

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

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