footnote vs compose

footnote is a noun but compose is not a noun.

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

As verbs, compose is a hypernym of footnote; that is, compose is a word with a broader meaning than footnote:

Other hypernyms of footnote include indite, pen, write.

footnote (noun)	compose (noun)
a printed note placed below the text on a printed page

footnote (verb)	compose (verb)
add explanatory notes to or supply with critical comments	make up plans or basic details for
	produce a literary work
	write music
	put together out of existing material
	calm (someone, especially oneself); make quiet
	form the substance of