notebook vs jotter

notebook and jotter both are nouns.

Word	Noun	Adjective	Verb	Adverb
notebook	Yes	No	No	No
jotter	Yes	No	No	No

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

Other hyponyms of notebook include commonplace book, playbook, coil notebook, spiral notebook.

notebook (noun)	jotter (noun)
a small compact portable computer	a small notebook for rough notes
a book with blank pages for recording notes or memoranda