blank space vs indent

blank space and indent both are nouns.

Word	Noun	Adjective	Verb	Adverb
blank space	Yes	No	No	No
indent	Yes	No	Yes	No

As nouns, indent is a hyponym of blank space; that is, indent is a word with a more specific, narrower meaning than blank space:

Other hyponyms of blank space include margin, indentation, indention, indenture.

blank space (noun)	indent (noun)
a blank area	an order for goods to be exported or imported
	the space left between the margin and the start of an indented line

blank space (verb)	indent (verb)
	bind by or as if by indentures, as of an apprentice or servant
	make a depression into
	cut or tear along an irregular line so that the parts can later be matched for authentication
	notch the edge of or make jagged
	set in from the margin