Helistop vs. Helipad

Helistopnoun

A place where a helicopter can land.

Helipadnoun

(aviation) A small landing place for helicopters, denoted by a large "H".

Helipad

A helipad is a landing area or platform for helicopters and powered lift aircraft. While helicopters and powered lift aircraft are able to operate on a variety of relatively flat surfaces, a fabricated helipad provides a clearly marked hard surface away from obstacles where such aircraft can land safely.