typo vs typographical error

typo and typographical error both are nouns.

Word	Noun	Adjective	Verb	Adverb
typo	Yes	No	No	No
typographical error	Yes	No	No	No

As nouns, typo and typographical error are synonyms defined as:

typo and typographical error: a mistake in printed matter resulting from mechanical failures of some kind

Other synonyms of typo include erratum, literal, literal error, misprint.

typo (noun)	typographical error (noun)
a mistake in printed matter resulting from mechanical failures of some kind	a mistake in printed matter resulting from mechanical failures of some kind