Answer:
Improve
The G is silent (but may affect pronunciation) in these types of words:
-IGH words : high, sigh, sleigh, weigh
-IGHT words : flight, light, height, weight
-IGN words : benign, design, feign, reign, sign, campaign, foreign
-IGM and -AGM words : paradigm, diaphragm
-OUGH words: bough, though, rough, tough
-OUGHT words : bought, brought, fought, thought, wrought
-AUGHT words : caught, naughty, taught
GN- words : gnat, gnaw, gnome, gnomon