focus vs think

focus and think both are nouns.

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

As verbs, think is a hypernym of focus; that is, think is a word with a broader meaning than focus:

focus: direct one's attention on something
think: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

Other hypernyms of focus include cerebrate, cogitate.

As verbs, think is a hyponym of focus; that is, think is a word with a more specific, narrower meaning than focus:

Other hyponyms of focus include absorb, engross, engulf, immerse, plunge, soak up, steep, recall, zoom in, hear, listen, take heed.

focus (noun)	think (noun)
maximum clarity or distinctness of an image rendered by an optical system	an instance of deliberate thinking
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)	think (verb)
become focussed or come into focus	bring into a given condition by mental preoccupation
put (an image) into focus	use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
direct one's attention on something	judge or regard; look upon; judge
bring into focus or alignment; to converge or cause to converge; of ideas or emotions	recall knowledge from memory; have a recollection
cause to converge on or toward a central point	expect, believe, or suppose
	have in mind as a purpose
	be capable of conscious thought
	focus one's attention on a certain state
	decide by pondering, reasoning, or reflecting
	ponder; reflect on, or reason about
	have or formulate in the mind
	dispose the mind in a certain way
	imagine or visualize