handbook vs guidebook

handbook and guidebook both are nouns.

Word	Noun	Adjective	Verb	Adverb
handbook	Yes	No	No	No
guidebook	Yes	No	No	No

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

handbook: a concise reference book providing specific information about a subject or location
guidebook: something that offers basic information or instruction

Other hyponyms of handbook include manual, bible, guide, ready reckoner, reckoner.

handbook (noun)	guidebook (noun)
a concise reference book providing specific information about a subject or location	something that offers basic information or instruction