Narrow is a related term of sparing.
As adjectives the difference between narrow and sparing
is that
narrow is having a small width; not wide; slim; slender; having opposite edges or sides that are close, especially by comparison to length or depth while
sparing is prudent and restrained in the use of resources; careful, economical or frugal.
As verbs the difference between narrow and sparing
is that
narrow is to reduce in width or extent; to contract while
sparing is .
As a noun narrow
is (chiefly|in the plural) a narrow passage, especially a contracted part of a stream, lake, or sea; a strait connecting two bodies of water.