boundary vs utmost

boundary and utmost both are nouns.

Word	Noun	Adjective	Verb	Adverb
boundary	Yes	No	No	No
utmost	Yes	Yes	No	No

As nouns, utmost is a hyponym of boundary; that is, utmost is a word with a more specific, narrower meaning than boundary:

boundary (noun)	utmost (noun)
the greatest possible degree of something	the greatest possible degree
the line or plane indicating the limit or extent of something
a line determining the limits of an area

boundary (adjective)	utmost (adjective)
	(comparatives of `far') most remote in space or time or order
	of the greatest possible degree or extent or intensity