focus vs blur

focus and blur both are nouns.

Word	Noun	Adjective	Verb	Adverb
focus	Yes	No	Yes	No
blur	Yes	No	Yes	No

focus (noun)	blur (noun)
maximum clarity or distinctness of an image rendered by an optical system	a hazy or indistinct representation
maximum clarity or distinctness of an idea
the concentration of attention or energy on something
a fixed reference point on the concave side of a conic section
a point of convergence of light (or other radiation) or a point from which it diverges
a central point or locus of an infection in an organism
special emphasis attached to something

focus (verb)	blur (verb)
become focussed or come into focus	become vague or indistinct
put (an image) into focus	make dim or indistinct
direct one's attention on something	make unclear, indistinct, or blurred
bring into focus or alignment; to converge or cause to converge; of ideas or emotions	make a smudge on; soil by smudging
cause to converge on or toward a central point	to make less distinct or clear
	become glassy; lose clear vision