type vs double-space

type is a noun but double-space is not a noun.

Word	Noun	Adjective	Verb	Adverb
type	Yes	No	Yes	No
double-space	No	No	Yes	No

As verbs, double-space is a hyponym of type; that is, double-space is a word with a more specific, narrower meaning than type:

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

type (noun)	double-space (noun)
a small metal block bearing a raised character on one end; produces a printed character when inked and pressed on paper
a subdivision of a particular kind of thing
all of the tokens of the same symbol
printed characters
(biology) the taxonomic group whose characteristics are used to define the next higher taxon
a person of a specified kind (usually with many eccentricities)

type (verb)	double-space (verb)
identify as belonging to a certain type	type with a full space between lines
write by means of a keyboard with types