Nouns

(n)higha lofty level or position or degree“summer temperatures reached an all-time high”
(n)highan air mass of higher than normal pressure“the east coast benefits from a Bermuda high”
(n)higha state of sustained elation“I'm on a permanent high these days”
(n)higha state of altered consciousness induced by alcohol or narcotics“they took drugs to get a high on”
(n)high, heightsa high place“they stood on high and observed the countryside”, “he doesn't like heights”
(n)senior high school, senior high, high, highschool, high schoola public secondary school usually including grades 9 through 12“he goes to the neighborhood highschool”
(n)high gear, higha forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed

Adjectives

(a)highgreater than normal in quantity or amount“a high temperature”, “a high price”, “the high point of his career”, “high risks”, “has high hopes”, “the river is high”, “he has a high opinion of himself”
(a)high(literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like ‘knee-high’)“a high mountain”, “high ceilings”, “high buildings”, “a high forehead”, “a high incline”, “a foot high”
(s)eminent, highstanding above others in quality or position“people in high places”, “the high priest”, “eminent members of the community”
(a)high, high-pitchedused of sounds and voices; high in pitch or frequency
(s)high, in high spiritshappy and excited and energetic
(s)gamey, gamy, high(used of the smell of meat) smelling spoiled or tainted
(s)high, mellowslightly and pleasantly intoxicated from alcohol or a drug (especially marijuana)

Adverbs

(r)high, high upat a great altitude“he climbed high on the ladder”
(r)highin or to a high position, amount, or degree“prices have gone up far too high”
(r)high, richly, luxuriouslyin a rich manner“he lives high”
(r)highfar up toward the source“he lives high up the river”