footnote vs footer

footnote and footer both are nouns.

Word	Noun	Adjective	Verb	Adverb
footnote	Yes	No	Yes	No
footer	Yes	No	No	No

As nouns, footnote and footer are synonyms defined as:

footnote and footer: a printed note placed below the text on a printed page

footnote (noun)	footer (noun)
a printed note placed below the text on a printed page	a printed note placed below the text on a printed page
	a person who travels by foot
	(used only in combinations) the height or length of something in feet

footnote (verb)	footer (verb)
add explanatory notes to or supply with critical comments