Acute
Part of speech: noun
Definition: An acute accent.
Part of speech: verb
Definition: To give an acute sound to.
Part of speech: adjective
Definition: Urgent. sensitive Short, quick. Of an angle, fewer than 90 degrees. Of a triangle, acute-angled. With the sides meeting directly to form a pointed acute angle at the apex, base, or both. Of an abnormal condition of recent or sudden onset, in contrast to delayed onset; this sense does not imply severity (unlike the common usage). Of a short-lived condition, in contrast to a chronic condition; this sense also does not imply severity. Having an acute accent.
Example sentence: I went to the doctor and he said I had acute appendicitis, and I said compared to who?
Critical
Part of speech: adjective
Definition: Inclined to find fault or criticize; fastidious; captious; censorious; exacting.Pertaining to, or indicating, a crisis or turning point.Extremely important.Relating to criticism or careful analysis, such as literary or film criticism.Of a condition involving unstable vital signs and an unfavorable prognosis.Likely to go out of control if disturbed, that is, opposite of stable.Of the point (in temperature, reagent concentration etc.) where a nuclear or chemical reaction becomes self-sustaining.
Example sentence: The impending teacher shortage is the most critical education issue we will face in the next decade.