ready reckoner vs enchiridion

ready reckoner and enchiridion both are nouns.

Word	Noun	Adjective	Verb	Adverb
ready reckoner	Yes	No	No	No
enchiridion	Yes	No	No	No

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

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

Other hypernyms of ready reckoner include handbook, vade mecum.

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