Pitch - aircraft nose up or down, controlled by pushing back and forward on controls
Pitch Trim - adjustment to the 'neutral' position so the nose can stay at the attitude wanted. Needs adjustment with changes in speed and power and whether climbing or descending (and other things as well). Commonly adjusted by an small switch on the control wheel (or purely manual on some basic aircraft). Usually an electric motor and gearbox adjusting some part of the tailplane (or the whole thing) or pulling on a spring.
Pitch Trim runaway - electrical or computer fault that operates the trim without input from the pilot. Can be disastrous - see 737MAX.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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