script vs tachygraphy

script and tachygraphy both are nouns.

Word	Noun	Adjective	Verb	Adverb
script	Yes	No	Yes	No
tachygraphy	Yes	No	No	No

As nouns, tachygraphy is a hyponym of script; that is, tachygraphy is a word with a more specific, narrower meaning than script:

script: something written by hand
tachygraphy: a method of writing rapidly using an abbreviated symbolic system

script (noun)	tachygraphy (noun)
a written version of a play or other dramatic composition; used in preparing for a performance	a method of writing rapidly using an abbreviated symbolic system
a particular orthography or writing system
something written by hand

script (verb)	tachygraphy (verb)
write a script for