ready reckoner vs vade mecum

ready reckoner and vade mecum both are nouns.

Word	Noun	Adjective	Verb	Adverb
ready reckoner	Yes	No	No	No
vade mecum	Yes	No	No	No

As nouns, vade mecum is a hypernym of ready reckoner; that is, vade mecum is a word with a broader meaning than ready reckoner:

ready reckoner: a handbook of tables used to facilitate computation
vade mecum: a concise reference book providing specific information about a subject or location

Other hypernyms of ready reckoner include enchiridion, handbook.

ready reckoner (noun)	vade mecum (noun)
a handbook of tables used to facilitate computation	a concise reference book providing specific information about a subject or location