Definition:  reach a highest point, either of a specified value or at a specified time (đạt tới đỉnh cao nhất)

Example: the peak hour (giờ cao điểm)

Definition: ground that is permanently frozen (tầng đất bị đóng băng vĩnh cửu)

Collocation: none

Example: 

Permafrost exists in both North and South poles of the world

Origin: permafrost = permanent + frost

Aggregate of small organisms that float or drift in water.

Ex: All of student, we could draw on the capital in the bank-those millions of years of deposits of ferns and PLANKTON and dinosaurs that time had compressed into and gas and oil. 

Definition: Same meaning with wealthy.

Ex: He wished the young couple a life of happiness and prosperity.