slide rule vs slipstick

slide rule and slipstick both are nouns.

Word	Noun	Adjective	Verb	Adverb
slide rule	Yes	No	No	No
slipstick	Yes	No	No	No

As nouns, slide rule and slipstick are synonyms defined as:

slide rule and slipstick: analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators

slide rule (noun)	slipstick (noun)
analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators	analog computer consisting of a handheld instrument used for rapid calculations; have been replaced by pocket calculators