mnemometer vs apparatus

mnemometer and apparatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
mnemometer	Yes	No	No	No
apparatus	Yes	No	No	No

As nouns, apparatus is a hypernym of mnemometer; that is, apparatus is a word with a broader meaning than mnemometer:

mnemometer: An outdated mechanical device used for presenting a series of stimuli to be memorized.
apparatus: equipment designed to serve a specific function

Other hypernyms of mnemometer include setup.

mnemometer (noun)	apparatus (noun)
An outdated mechanical device used for presenting a series of stimuli to be memorized.	equipment designed to serve a specific function
	(anatomy) a group of body parts that work together to perform a given function