typewrite vs backspace

typewrite is not a noun while backspace is a noun.

Word	Noun	Adjective	Verb	Adverb
typewrite	No	No	Yes	No
backspace	Yes	No	Yes	No

As verbs, backspace is a hyponym of typewrite; that is, backspace is a word with a more specific, narrower meaning than typewrite:

Other hyponyms of typewrite include shift, double-space, triple-space, touch-type.

typewrite (noun)	backspace (noun)
	the typewriter key used for back spacing

typewrite (verb)	backspace (verb)
write by means of a keyboard with types	hit the backspace key on a computer or typewriter keyboard