Nouns

(n)acute accent, acute, aigua mark placed above a vowel to indicate pronunciation

Adjectives

(a)acutehaving or experiencing a rapid onset and short but severe course“acute appendicitis”, “the acute phase of the illness”, “acute patients”
(s)acute, intenseextremely sharp or severe“acute pain”, “felt acute annoyance”, “intense itching and burning”
(s)acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharphaving or demonstrating ability to recognize or draw fine distinctions“an acute observer of politics and politicians”, “incisive comments”, “icy knifelike reasoning”, “as sharp and incisive as the stroke of a fang”, “penetrating insight”, “frequent penetrative observations”
(a)acuteof an angle; less than 90 degrees
(s)acuate, acute, sharp, needlelikeending in a sharp point
(s)acuteof critical importance and consequence“an acute (or critical) lack of research funds”